Using partial sums, find Value Pak’s error when adding 56 + 37.

by Sherry McElhannon | Apr 20, 2023

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Using partial sums, find Value Pak’s error when adding 43 + 56.

by Sherry McElhannon | Apr 20, 2023

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Using compensation, find Abracus’s error when adding 25 + 27

by Sherry McElhannon | Apr 20, 2023

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Using compensation, find Abracus’s error when adding 19 + 21.

by Sherry McElhannon | Apr 18, 2023

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When decomposing, find D.C.’s error when adding 29 + 58.

by Sherry McElhannon | Apr 18, 2023

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