Rounding is when you take a decimal or fraction and make it the closest whole number. If the number you are rounding is five or higher round up and if it's four or below round down. For instance, 7.2 rounds down to 7, 6.8 rounds up to 7.
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Rounding to the nearest hundredth is more accurate.
54+86
65 - 9 = 56
By rounding each of the numbers involved.
It is the accuracy in the estimate of the constant or the effect of rounding.