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भारतीय अबेकस के बीच तुलना
और पुराना अबेकस
Time saving in the class
العداد القديم
The same is not possible here because of the fall of the beads.
العداد الهندي
The Teacher can identify / verify the answers from her place when the answers are shown by the students because of the sliders did not fall hence the students are able to do more sums.
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