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Is the question suppose to be "a compatible number"? If it is then it's a number that is close to a number in a math problem. So it makes it easier to estimate if you have to use mental math.

For example : to solve 40/4.7

--> you round 4.7 to 5

--> then divide 40/5 = 8

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14y ago

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Q: What is acompatible number?
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