Compatible numbers means to round like an example 402+198 now what we have to do is take the 198 and make it 200 and we have to take 402 and make 400 you see how I add 2 numbers in one and subtract 2 from the other.
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75
5391
200
Compatible numbers are numbers that are close in value to the actual numbers and easy to add, subtract, multiply, or divide mentally.So a logical compatible number for 77 would be 80.
800