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By rounding each term to a whole number, estimate five and four-fifths divided by two and a half.
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We have the expression five and four-fifths divided by two and a half.
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We need to round each of these terms to their nearest whole number.
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Four-fifths is almost a whole.
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It’s almost five-fifths.
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And that means we would round five and four-fifths up.
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Instead of having five and four-fifths, we would round to six.
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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.
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So we round two and a half up to three.
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And then we say six divided by three equals two.
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We can estimate that five and four-fifths divided by two and a half would be equal to around two.