Definition of Compatible Number
Compatible numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply, or divide mentally.
They are useful in estimating the sum, difference, product, or quotient.
Examples of Compatible Number
Estimate 13 梅 3.6
To estimate the quotient, choose the compatible numbers 12 and 4 as 12 and 4 are compatible with each other. Also notice that 12 is closer to 13 and 4 is closer to 3.6.
Now for your problem:
you can solve it in either of 2 ways:
740 divided by 10 = 74
or 720 divided by 9 = 80
The second estimate is much closer to the real answer because the numbers are more realistic...but both use compatible number theory.
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