Estimate the difference. Round each number to the nearest whole number, then subtract.
6 1/2 - 1 3/7
The difference is approximately
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In the example below, notice that rounding to the nearest ten produces a far more accurate estimate than rounding to the nearest hundred. In general, rounding to the lesser place value is more accurate, but it takes more steps. Estimate the sum 1,472 + 398 + 772 + 164 by first rounding each number to the nearest ten.
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