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how to estimate using compatible number method​

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You round your number down to the lesser. Number if your number is closer to the upper benchmark you round your number up to the greater. Number. And if your number is exactly at the halfway.

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Compatible numbers are pairs of numbers that are easy to add subtract multiply or divide mentally. When using estimation to approximate a calculation, replace actual numbers with compatible numbers. The numbers 500 and 300 are compatible for addition, since the sum of 800 can easily calculated mental

Some examples of compatible numbers when doing multiplication are 200 and 40, 1100 and 40, 25 and 4.

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