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Compatible numbers are numbers that look friendly with each other when we do mental calculation to estimate a product or a quotient.

So 420 would be an example for 419.

Say I want to divide 419 by 2.

I can do it easily for 420, it is 210

But I increased 419 by 1 so I need to subtract half of 1 which is .5 and the answer is 209.5.
I subtracted half or .5 since I increased 419 by 1 and I am dividing by 2.

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15y ago
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Q: Compatible number for 419
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