In general, numbers are not compatible or otherwise in isolation. They are compatible in the context of other numbers. Two (or more) numbers are compatible if their sum (or other combination) is a number which YOU find easy to work with. As you acquire more experience, you may find that more and more numbers become compatible.
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compatible numbers is just like to round or estimate a number. Ex: 44 the compatible number is to 40. because if the number less than five is rounded to the nearest ten (down). Ex: 56 the compatible number is 60. why? because a number greater than 5 is rounded up.
It could be 76 - not divisible by 5. It could be 75 - not divisible by 2.
A compatible number is a number that is easy to add when you add it together.
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.
200