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only when the answer is 10 or more, for example, 14+18, you would add the four and the eight which would give you 12, you would keep the 2 and add it to the next part of the problem you would do, which is 1+1 (actually 10 plus 10) and then you add the one from the 12 and then you get 3. But if you were doing 4+4, you wouldn't have to.

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13y ago

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