Estimate sums, products, quotients, and percent results, then judge whether an exact answer is reasonable.
Use a specified benchmark-percent rewrite
Problem
Rewrite \(18\%\) as \(10\%~+~5\%~+~3\%\), then calculate \(18\%\) of \(250\) exactly.
Big Picture
What this problem is really about
The percent is being decomposed into familiar parts, but every part still applies to the same whole. We’ll find ten percent, use it to build five percent, find one percent to build three percent, and then add the three amounts. Because the percent parts add exactly to eighteen percent, their amounts will give the exact result.
Inside Gozunta
Turn the preview into practice.
More than a preview
Gozunta lets you study this problem—and more than 10,000 others.
Create targeted learning sessions, use hints, check your answer, read the walkthrough, watch the video, print the work, and track your progress.
