Estimate sums, products, quotients, and percent results, then judge whether an exact answer is reasonable.
Estimate a quotient with a specified compatible dividend
Problem
Estimate \(618~\div~20\) using \(620\) as the compatible dividend. Write the compatible-number equation and quotient.
Big Picture
What this problem is really about
This quotient is estimated by replacing only the dividend with the specified nearby compatible number and keeping the divisor unchanged. We’ll split that compatible dividend into easy multiples of the divisor and combine their quotients. Because the replacement is close to the original dividend, its quotient is a useful estimate.
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