When decomposing, find D.C.’s error when adding 38 + 15.

by Sherry McElhannon | Apr 18, 2023

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By decomposing the problem in two different ways, solve 189 + 21.

by Sherry McElhannon | Apr 13, 2023

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Using partial sums, solve 64 + 25.

by Sherry McElhannon | Apr 13, 2023

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Using an abacus, show how you can use compensation to add 58 + 22.

by Sherry McElhannon | Apr 13, 2023

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Using an abacus, show how you can use doubles to add 25 + 26.

by Sherry McElhannon | Apr 13, 2023

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