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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
examples of number relation problems
A compatible number is a number that is easy to add when you add it together.
compatible numbers mean , for example, 56 x 8. if you wanna find compatible numbers to make the problem easier, then see what 56 is close to. its close to 70, so 70 x 8 would be 560.
The answer depends on the context. If considering the 1877 + 11 then a compatible number would be 1880 but if considering 1877 + 11,000,000,000,000,000 the compatible number is 0.