Video: Rounding Mixed Numbers to Whole Numbers to Estimate the Division of Mixed Numbers

By rounding each term to a whole number, estimate 5 4/5 ÷ 2 1/2.

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Video Transcript

By rounding each term to a whole number, estimate five and four-fifths divided by two and a half.

We have the expression five and four-fifths divided by two and a half. We need to round each of these terms to their nearest whole number. Four-fifths is almost a whole. It’s almost five-fifths. And that means we would round five and four-fifths up. Instead of having five and four-fifths, we would round to six.

Two and a half is exactly halfway between two and three, but our rules for rounding tell us if it’s halfway we round up. So we round two and a half up to three. And then we say six divided by three equals two. We can estimate that five and four-fifths divided by two and a half would be equal to around two.

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