zophiaalfaro zophiaalfaro

29-05-2016
Mathematics

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how do you use a abacus in a simple way?

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JunhaoZ JunhaoZ

29-05-2016

Each column is a digit, and the top two beads each represent 5 and the bottom 5 beads each represent 1. To read it, you add up the values of the "top" beads that are dropped down and the "bottom" beads that are raised up, and you read the number left to right.

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