{"id":2589,"date":"2023-10-10T00:02:47","date_gmt":"2023-10-09T22:02:47","guid":{"rendered":"https:\/\/www.din.usi.ch\/blog\/?p=2589"},"modified":"2023-10-10T02:19:33","modified_gmt":"2023-10-10T00:19:33","slug":"abacus","status":"publish","type":"post","link":"https:\/\/www.din.usi.ch\/blog\/2023\/10\/10\/abacus\/","title":{"rendered":"Abacus"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2589\" class=\"elementor elementor-2589\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-2a13df1 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"2a13df1\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7da9632\" data-id=\"7da9632\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-44a50013 elementor-widget elementor-widget-text-editor\" data-id=\"44a50013\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.16.0 - 20-09-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>The word abacus comes from the Greek word abaks meaning table, which in turn comes from the Semitic word abaq meaning sand. Used as early as the time of the Greeks and Romans, the earliest abacus consisted of a table covered with a thin layer of sand where calculations were made with a stylus. The Chinese-type abacus consists of a series of rods that, from right to left, indicate the different orders of value: on the first rod the units, on the second the tens, on the third the hundreds, on the fourth the thousands, etc. Each rod contains seven balls and a bar that divides five of them-in the part called earth-from two others-in the part called sky. The value of each ball in &#8220;sky&#8221; corresponds to five times those in &#8220;earth.&#8221;\u00a0There is also a six-ball model (Japanese abacus), which is more complicated in use, with 5 balls for &#8220;earth&#8221; and 1 for &#8220;sky.&#8221;<\/p><p><!-- \/wp:gallery --><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-75cc134 elementor-arrows-position-inside elementor-pagination-position-outside elementor-widget elementor-widget-image-carousel\" data-id=\"75cc134\" data-element_type=\"widget\" data-settings=\"{&quot;slides_to_show&quot;:&quot;2&quot;,&quot;navigation&quot;:&quot;both&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;pause_on_hover&quot;:&quot;yes&quot;,&quot;pause_on_interaction&quot;:&quot;yes&quot;,&quot;autoplay_speed&quot;:5000,&quot;infinite&quot;:&quot;yes&quot;,&quot;speed&quot;:500,&quot;image_spacing_custom&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:20,&quot;sizes&quot;:[]},&quot;image_spacing_custom_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;image_spacing_custom_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"image-carousel.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.16.0 - 20-09-2023 *\/\n.elementor-widget-image-carousel .swiper,.elementor-widget-image-carousel .swiper-container{position:static}.elementor-widget-image-carousel .swiper-container .swiper-slide figure,.elementor-widget-image-carousel .swiper .swiper-slide figure{line-height:inherit}.elementor-widget-image-carousel .swiper-slide{text-align:center}.elementor-image-carousel-wrapper:not(.swiper-container-initialized):not(.swiper-initialized) .swiper-slide{max-width:calc(100% \/ var(--e-image-carousel-slides-to-show, 3))}<\/style>\t\t<div class=\"elementor-image-carousel-wrapper swiper-container\" dir=\"ltr\">\n\t\t\t<div class=\"elementor-image-carousel swiper-wrapper swiper-image-stretch\" aria-live=\"off\">\n\t\t\t\t\t\t\t\t<div class=\"swiper-slide\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"1 of 2\"><figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/PHOTO_abacus_1-640x640.png\" alt=\"PHOTO_abacus_1\" \/><\/figure><\/div><div class=\"swiper-slide\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"2 of 2\"><figure class=\"swiper-slide-inner\"><img decoding=\"async\" class=\"swiper-slide-image\" src=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/PHOTO_abacus_2-640x640.jpg\" alt=\"PHOTO_abacus_2\" \/><\/figure><\/div>\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-swiper-button elementor-swiper-button-prev\" role=\"button\" tabindex=\"0\">\n\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-angle-double-left\"><\/i>\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"elementor-swiper-button elementor-swiper-button-next\" role=\"button\" tabindex=\"0\">\n\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-angle-double-right\"><\/i>\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t<div class=\"swiper-pagination\"><\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ba4eb8c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ba4eb8c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-dca044a\" data-id=\"dca044a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a5a6dd3 elementor-widget elementor-widget-heading\" data-id=\"a5a6dd3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.16.0 - 20-09-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h2 class=\"elementor-heading-title elementor-size-default\">How to play<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-40a26fa elementor-widget elementor-widget-text-editor\" data-id=\"40a26fa\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>To learn how to represent number and do operations with the abacus we recommend these videos:<\/p><ul><li><a href=\"https:\/\/www.youtube.com\/watch?v=FTVXUG_PngE\">VIDEO 1 (see below)<\/a><\/li><li><a href=\"https:\/\/www.youtube.com\/watch?v=I8EZvig5fOU\">VIDEO 2<\/a><\/li><li><a href=\"https:\/\/www.youtube.com\/watch?v=YQLjDD9SzGA\">COMPLEMENTARY METHOD<\/a><\/li><li><a href=\"https:\/\/www.youtube.com\/watch?v=22NdwzuEZi4\">EXCHANGE METHOD<\/a><\/li><li><a href=\"https:\/\/www.youtube.com\/watch?v=r0aKV3HqDzA\">COMPLEMENTARY METHOD<\/a><\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-99eba59 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"99eba59\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fbe536f\" data-id=\"fbe536f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a1d114f elementor-widget elementor-widget-video\" data-id=\"a1d114f\" data-element_type=\"widget\" data-settings=\"{&quot;youtube_url&quot;:&quot;https:\\\/\\\/www.youtube.com\\\/watch?v=FTVXUG_PngE&quot;,&quot;video_type&quot;:&quot;youtube&quot;,&quot;controls&quot;:&quot;yes&quot;}\" data-widget_type=\"video.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.16.0 - 20-09-2023 *\/\n.elementor-widget-video .elementor-widget-container{overflow:hidden;transform:translateZ(0)}.elementor-widget-video .elementor-wrapper{aspect-ratio:var(--video-aspect-ratio)}.elementor-widget-video .elementor-wrapper iframe,.elementor-widget-video .elementor-wrapper video{height:100%;width:100%;display:flex;border:none;background-color:#000}@supports not (aspect-ratio:1\/1){.elementor-widget-video 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.elementor-custom-embed-image-overlay{position:relative;overflow:hidden;height:0;padding-bottom:calc(100% \/ var(--video-aspect-ratio))}.elementor-widget-video .elementor-custom-embed-image-overlay img{position:absolute;top:0;right:0;bottom:0;left:0}}.elementor-widget-video .e-hosted-video .elementor-video{-o-object-fit:cover;object-fit:cover}.e-con-inner>.elementor-widget-video,.e-con>.elementor-widget-video{width:var(--container-widget-width);--flex-grow:var(--container-widget-flex-grow)}<\/style>\t\t<div class=\"elementor-wrapper elementor-open-inline\">\n\t\t\t<div class=\"elementor-video\"><\/div>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9e25581 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9e25581\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-be0fc40\" data-id=\"be0fc40\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a5a9573 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"a5a9573\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.16.0 - 20-09-2023 *\/\n.elementor-widget-divider{--divider-border-style:none;--divider-border-width:1px;--divider-color:#0c0d0e;--divider-icon-size:20px;--divider-element-spacing:10px;--divider-pattern-height:24px;--divider-pattern-size:20px;--divider-pattern-url:none;--divider-pattern-repeat:repeat-x}.elementor-widget-divider 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var(--divider-color)}.elementor-widget-divider--separator-type-pattern{--divider-border-style:none}.elementor-widget-divider--separator-type-pattern.elementor-widget-divider--view-line .elementor-divider-separator,.elementor-widget-divider--separator-type-pattern:not(.elementor-widget-divider--view-line) .elementor-divider-separator:after,.elementor-widget-divider--separator-type-pattern:not(.elementor-widget-divider--view-line) .elementor-divider-separator:before,.elementor-widget-divider--separator-type-pattern:not([class*=elementor-widget-divider--view]) .elementor-divider-separator{width:100%;min-height:var(--divider-pattern-height);-webkit-mask-size:var(--divider-pattern-size) 100%;mask-size:var(--divider-pattern-size) 100%;-webkit-mask-repeat:var(--divider-pattern-repeat);mask-repeat:var(--divider-pattern-repeat);background-color:var(--divider-color);-webkit-mask-image:var(--divider-pattern-url);mask-image:var(--divider-pattern-url)}.elementor-widget-divider--no-spacing{--divider-pattern-size:auto}.elementor-widget-divider--bg-round{--divider-pattern-repeat:round}.rtl .elementor-widget-divider .elementor-divider__text{direction:rtl}.e-con-inner>.elementor-widget-divider,.e-con>.elementor-widget-divider{width:var(--container-widget-width,100%);--flex-grow:var(--container-widget-flex-grow)}<\/style>\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-73266de elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"73266de\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ee84257\" data-id=\"ee84257\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-594c62a elementor-tabs-view-horizontal elementor-widget elementor-widget-tabs\" data-id=\"594c62a\" data-element_type=\"widget\" data-widget_type=\"tabs.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.16.0 - 20-09-2023 *\/\n.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tabs-wrapper{width:25%;flex-shrink:0}.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tab-desktop-title.elementor-active{border-right-style:none}.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tab-desktop-title.elementor-active:after,.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tab-desktop-title.elementor-active:before{height:999em;width:0;right:0;border-right-style:solid}.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tab-desktop-title.elementor-active:before{top:0;transform:translateY(-100%)}.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tab-desktop-title.elementor-active:after{top:100%}.elementor-widget-tabs.elementor-tabs-view-horizontal .elementor-tab-desktop-title{display:table-cell}.elementor-widget-tabs.elementor-tabs-view-horizontal .elementor-tab-desktop-title.elementor-active{border-bottom-style:none}.elementor-widget-tabs.elementor-tabs-view-horizontal .elementor-tab-desktop-title.elementor-active:after,.elementor-widget-tabs.elementor-tabs-view-horizontal .elementor-tab-desktop-title.elementor-active:before{bottom:0;height:0;width:999em;border-bottom-style:solid}.elementor-widget-tabs.elementor-tabs-view-horizontal .elementor-tab-desktop-title.elementor-active:before{right:100%}.elementor-widget-tabs.elementor-tabs-view-horizontal .elementor-tab-desktop-title.elementor-active:after{left:100%}.elementor-widget-tabs .elementor-tab-content,.elementor-widget-tabs .elementor-tab-title,.elementor-widget-tabs .elementor-tab-title:after,.elementor-widget-tabs .elementor-tab-title:before,.elementor-widget-tabs .elementor-tabs-content-wrapper{border:1px #d5d8dc}.elementor-widget-tabs .elementor-tabs{text-align:left}.elementor-widget-tabs .elementor-tabs-wrapper{overflow:hidden}.elementor-widget-tabs .elementor-tab-title{cursor:pointer;outline:var(--focus-outline,none)}.elementor-widget-tabs .elementor-tab-desktop-title{position:relative;padding:20px 25px;font-weight:700;line-height:1;border:solid transparent}.elementor-widget-tabs .elementor-tab-desktop-title.elementor-active{border-color:#d5d8dc}.elementor-widget-tabs .elementor-tab-desktop-title.elementor-active:after,.elementor-widget-tabs .elementor-tab-desktop-title.elementor-active:before{display:block;content:\"\";position:absolute}.elementor-widget-tabs .elementor-tab-desktop-title:focus-visible{border:1px solid #000}.elementor-widget-tabs .elementor-tab-mobile-title{padding:10px;cursor:pointer}.elementor-widget-tabs .elementor-tab-content{padding:20px;display:none}@media (max-width:767px){.elementor-tabs .elementor-tab-content,.elementor-tabs .elementor-tab-title{border-style:solid solid none}.elementor-tabs .elementor-tabs-wrapper{display:none}.elementor-tabs .elementor-tabs-content-wrapper{border-bottom-style:solid}.elementor-tabs .elementor-tab-content{padding:10px}}@media (min-width:768px){.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tabs{display:flex}.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tabs-wrapper{flex-direction:column}.elementor-widget-tabs.elementor-tabs-view-vertical .elementor-tabs-content-wrapper{flex-grow:1;border-style:solid solid solid none}.elementor-widget-tabs.elementor-tabs-view-horizontal .elementor-tab-content{border-style:none solid solid}.elementor-widget-tabs.elementor-tabs-alignment-center .elementor-tabs-wrapper,.elementor-widget-tabs.elementor-tabs-alignment-end .elementor-tabs-wrapper,.elementor-widget-tabs.elementor-tabs-alignment-stretch .elementor-tabs-wrapper{display:flex}.elementor-widget-tabs.elementor-tabs-alignment-center .elementor-tabs-wrapper{justify-content:center}.elementor-widget-tabs.elementor-tabs-alignment-end .elementor-tabs-wrapper{justify-content:flex-end}.elementor-widget-tabs.elementor-tabs-alignment-stretch.elementor-tabs-view-horizontal .elementor-tab-title{width:100%}.elementor-widget-tabs.elementor-tabs-alignment-stretch.elementor-tabs-view-vertical .elementor-tab-title{height:100%}.elementor-tabs .elementor-tab-mobile-title{display:none}}<\/style>\t\t<div class=\"elementor-tabs\">\n\t\t\t<div class=\"elementor-tabs-wrapper\" role=\"tablist\" >\n\t\t\t\t\t\t\t\t\t<div id=\"elementor-tab-title-9361\" class=\"elementor-tab-title elementor-tab-desktop-title\" aria-selected=\"true\" data-tab=\"1\" role=\"tab\" tabindex=\"0\" aria-controls=\"elementor-tab-content-9361\" aria-expanded=\"false\">FOR TEACHER<\/div>\n\t\t\t\t\t\t\t\t\t<div id=\"elementor-tab-title-9362\" class=\"elementor-tab-title elementor-tab-desktop-title\" aria-selected=\"false\" data-tab=\"2\" role=\"tab\" tabindex=\"-1\" aria-controls=\"elementor-tab-content-9362\" aria-expanded=\"false\">ASSEMBLY SHEET<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t<div class=\"elementor-tabs-content-wrapper\" role=\"tablist\" aria-orientation=\"vertical\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-tab-title elementor-tab-mobile-title\" aria-selected=\"true\" data-tab=\"1\" role=\"tab\" tabindex=\"0\" aria-controls=\"elementor-tab-content-9361\" aria-expanded=\"false\">FOR TEACHER<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-9361\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"tabpanel\" aria-labelledby=\"elementor-tab-title-9361\" tabindex=\"0\" hidden=\"false\"><p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/abacus_2.png\" alt=\"\" width=\"1938\" height=\"815\" \/><\/p><p>The abacus is the oldest tool invented by man for solving calculations and is still used in Chinese schools for teaching today. To represent a number one moves the balls toward the horizontal rod, remembering that the balls at the top are worth five times those at the bottom of the same rod. In the figure above the number is 1&#8217;352&#8217;964&#8217;708.\u00a0<\/p><p>An important shortcoming of the abacus is that it does not allow past operations to be fixed, so if a mistake is made, everything has to be repeated from the beginning. Japanese companies got around this problem by having three abacists perform the same calculation at the same time: if the three solutions were identical, then the solution was correct.<\/p><p>Curiosity: In ancient China, abacuses with bamboo sticks were used, later tables prevailed on which division lines and columns were marked to indicate the different orders of units in the number system in use. Tokens representing the numbers were then placed on these lines so that any kind of calculation could be carried out.<\/p><\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-tab-title elementor-tab-mobile-title\" aria-selected=\"false\" data-tab=\"2\" role=\"tab\" tabindex=\"-1\" aria-controls=\"elementor-tab-content-9362\" aria-expanded=\"false\">ASSEMBLY SHEET<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-9362\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"tabpanel\" aria-labelledby=\"elementor-tab-title-9362\" tabindex=\"0\" hidden=\"hidden\"><p><a href=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/DIN_ABACUS_assembly_sheet.pdf\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-2630 size-full\" src=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/Abacus_3.png\" alt=\"\" width=\"1970\" height=\"1382\" srcset=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/Abacus_3.png 1970w, https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/Abacus_3-300x210.png 300w, https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/Abacus_3-1024x718.png 1024w, https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/Abacus_3-768x539.png 768w, https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/Abacus_3-1536x1078.png 1536w\" sizes=\"(max-width: 1970px) 100vw, 1970px\" \/><\/a><\/p><\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b34c165 elementor-widget elementor-widget-spacer\" data-id=\"b34c165\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.16.0 - 20-09-2023 *\/\n.elementor-column .elementor-spacer-inner{height:var(--spacer-size)}.e-con{--container-widget-width:100%}.e-con-inner>.elementor-widget-spacer,.e-con>.elementor-widget-spacer{width:var(--container-widget-width,var(--spacer-size));--align-self:var(--container-widget-align-self,initial);--flex-shrink:0}.e-con-inner>.elementor-widget-spacer>.elementor-widget-container,.e-con>.elementor-widget-spacer>.elementor-widget-container{height:100%;width:100%}.e-con-inner>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer,.e-con>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer{height:100%}.e-con-inner>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer>.elementor-spacer-inner,.e-con>.elementor-widget-spacer>.elementor-widget-container>.elementor-spacer>.elementor-spacer-inner{height:var(--container-widget-height,var(--spacer-size))}.e-con-inner>.elementor-widget-spacer.elementor-widget-empty,.e-con>.elementor-widget-spacer.elementor-widget-empty{position:relative;min-height:22px;min-width:22px}.e-con-inner>.elementor-widget-spacer.elementor-widget-empty .elementor-widget-empty-icon,.e-con>.elementor-widget-spacer.elementor-widget-empty .elementor-widget-empty-icon{position:absolute;top:0;bottom:0;left:0;right:0;margin:auto;padding:0;width:22px;height:22px}<\/style>\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-ee4dd4a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"ee4dd4a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-9bcdc70\" data-id=\"9bcdc70\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-cc173d5 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"cc173d5\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-c2a37e8 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"c2a37e8\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d0b5d0b\" data-id=\"d0b5d0b\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2b20529 elementor-widget elementor-widget-heading\" data-id=\"2b20529\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How to build<\/h2>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-571560a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"571560a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-ef8b0e8\" data-id=\"ef8b0e8\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b67417e elementor-widget elementor-widget-text-editor\" data-id=\"b67417e\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<h6><strong>EXHIBIT MATERIAL:<\/strong><\/h6><ul><li>Base pallet 120&#215;80 cm with wheels<\/li><li>Abacus structure \/\/ made of MDF wood<br \/>with brass rods; side panels can be opened for insertion of metal rods<\/li><li>Discs for Abacus \/\/ MDF stained red<\/li><li>Cardboard panel 35&#215;60 cm with explanatio<\/li><li>Calculator &#8211; abacus<\/li><\/ul>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-cd6c5ce\" data-id=\"cd6c5ce\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4fa4689 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"4fa4689\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong><span style=\"color: #333333; font-size: 17px;\">CLICK AND DOWNLOAD PRINT-READY .PDF FILES:<\/span><\/strong><\/p><p><a href=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/ITA_Abaco_35x60_35x12.pdf\">CARBOARD PANEL 35&#215;60 cm (ITA)<\/a><br \/><a href=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/FRA_Abaco_35x60_35x12.pdf\">CARDBOARD PANEL 35&#215;60 cm (FRA)<\/a><br \/><a href=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/10\/DE_cardboard_panel.pdf\">CARDBOARD PANEL 35&#215;60 cm (DE)<\/a><\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4945b76 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4945b76\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e89cedf\" data-id=\"e89cedf\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ee8b3e4 elementor-widget elementor-widget-gallery\" data-id=\"ee8b3e4\" data-element_type=\"widget\" data-settings=\"{&quot;gallery_layout&quot;:&quot;masonry&quot;,&quot;columns&quot;:2,&quot;gap&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:100,&quot;sizes&quot;:[]},&quot;overlay_description&quot;:&quot;caption&quot;,&quot;lazyload&quot;:&quot;yes&quot;,&quot;columns_tablet&quot;:2,&quot;columns_mobile&quot;:1,&quot;gap_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:10,&quot;sizes&quot;:[]},&quot;gap_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:10,&quot;sizes&quot;:[]},&quot;overlay_background&quot;:&quot;yes&quot;,&quot;content_hover_animation&quot;:&quot;fade-in&quot;}\" data-widget_type=\"gallery.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor-pro - v3.16.0 - 20-09-2023 *\/\n.elementor-gallery__container{min-height:1px}.elementor-gallery-item{position:relative;overflow:hidden;display:block;text-decoration:none;border:solid var(--image-border-width) var(--image-border-color);border-radius:var(--image-border-radius)}.elementor-gallery-item__content,.elementor-gallery-item__overlay{height:100%;width:100%;position:absolute;top:0;left:0}.elementor-gallery-item__overlay{mix-blend-mode:var(--overlay-mix-blend-mode);transition-duration:var(--overlay-transition-duration);transition-property:mix-blend-mode,transform,opacity,background-color}.elementor-gallery-item__image.e-gallery-image{transition-duration:var(--image-transition-duration);transition-property:filter,transform}.elementor-gallery-item__content{display:flex;flex-direction:column;justify-content:var(--content-justify-content,center);align-items:center;text-align:var(--content-text-align);padding:var(--content-padding)}.elementor-gallery-item__content>div{transition-duration:var(--content-transition-duration)}.elementor-gallery-item__content.elementor-gallery--sequenced-animation>div:nth-child(2){transition-delay:calc(var(--content-transition-delay) \/ 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.elementor-gallery__item-overlay-content__title{opacity:1}a.elementor-item.elementor-gallery-title{color:var(--galleries-title-color-normal)}a.elementor-item.elementor-gallery-title.elementor-item-active,a.elementor-item.elementor-gallery-title.highlighted,a.elementor-item.elementor-gallery-title:focus,a.elementor-item.elementor-gallery-title:hover{color:var(--galleries-title-color-hover)}a.elementor-item.elementor-gallery-title.elementor-item-active{color:var(--gallery-title-color-active)}.e-con-inner>.elementor-widget-gallery,.e-con>.elementor-widget-gallery{width:var(--container-widget-width);--flex-grow:var(--container-widget-flex-grow)}<\/style>\t\t<div class=\"elementor-gallery__container\">\n\t\t\t\t\t\t\t<div class=\"e-gallery-item elementor-gallery-item elementor-animated-content\">\n\t\t\t\t\t<div class=\"e-gallery-image elementor-gallery-item__image\" data-thumbnail=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/04\/moebelpalette-120-x-80-cm-moebelpalette-1-300x150.jpg\" data-width=\"300\" data-height=\"150\" aria-label=\"\" role=\"img\" ><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__content\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__description\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tpallet\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"e-gallery-item elementor-gallery-item elementor-animated-content\">\n\t\t\t\t\t<div class=\"e-gallery-image elementor-gallery-item__image\" data-thumbnail=\"https:\/\/www.din.usi.ch\/blog\/wp-content\/uploads\/2023\/04\/WabenplattenGraphilite-1-300x150.jpg\" data-width=\"300\" data-height=\"150\" aria-label=\"\" role=\"img\" ><\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__overlay\"><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__content\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-gallery-item__description\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\thoneycomb cardboard \/ laminated honeycomb cardboard\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e339d8a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e339d8a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-522c0d3\" data-id=\"522c0d3\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a238bca elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"a238bca\" data-element_type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>The word abacus comes from the Greek word abaks meaning table, which in turn comes from the Semitic word abaq meaning sand. Used as early as the time of the&hellip; <\/p>\n","protected":false},"author":1,"featured_media":2591,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,11],"tags":[39,32,33,53,31],"_links":{"self":[{"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/posts\/2589"}],"collection":[{"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/comments?post=2589"}],"version-history":[{"count":46,"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/posts\/2589\/revisions"}],"predecessor-version":[{"id":2651,"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/posts\/2589\/revisions\/2651"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/media\/2591"}],"wp:attachment":[{"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/media?parent=2589"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/categories?post=2589"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.din.usi.ch\/blog\/wp-json\/wp\/v2\/tags?post=2589"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}