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You can change 3.7 to 3.70 by looking at the 7's place, since there is no number after it.

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you can round by seeing if the tenths is higher than 50

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Youn can Round the numbers

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You can estimate decimal sums and diferences

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You can subtract add or estimate.

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You can round the decimals

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You can estimate 3.7 by looking at the 7 and rounding it to 4 because it is over 5.

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You can use benchmarks to estimate a close number

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You can estimate decimal sums and differences by rounding or using benchmarks

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You can estimate 3.7 by looking at the seven and it is over five, so the three becomes a four. The answer is 4.0

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You can round the numbers and add or subtratc

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by rounding then adding or subtracting

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You can estimate decimals by using benchmarks or rounding the numbers or decimals.

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You can estimate decimal sums and differences by rounding the decimal numbers.

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By benchmarks and rounding

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You can estimate by saying 5 or more round to the next number or under 4 you round down

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You can estimate 3.7 by looking at the 7 since 7 is higher than 5 the 3 rounds to a 4 the 7 becomes a 0.

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You can round or use benchmarks

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by  doing the 5 rule and estimating

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You get your estimates and then you subtract or add them to get your anwser