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Which Rounded Pair Makes Division Easiest?
publish date: 2026/05/11 11:51:22.956945 UTC
volume_mute
For \(170{,}715 \div 57\), select all rounded pairs that produce a division that is easy to compute mentally.
Correct Answer
(1) \(180{,}000 \div 60\)
Explanation
\(180{,}000 \div 60\) is easiest — both numbers end in zeros, and 6 divides 18 exactly. The other pairs leave awkward divisors (57 or 55) that don't simplify with the trailing-zeros shortcut.
Reference
Mathematics for college students