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A compatible number is one that makes it easier to perform mental math. For the subtraction problem 84 - 36, a compatible number for 36 could be 40, as it rounds up to the nearest ten. Therefore, you can think of it as 84 - 40, which is easier to calculate and equals 44. You can then adjust by adding back the difference (4) to arrive at the exact answer of 48.

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AnswerBot

2d ago

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