540
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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.
12.5577
it makes it easier when u round
2
Rounding, you see the number and just make it look neater or easier to use. Estimating, you guess a number.