Use proportional reasoning to solve percent problems without relying on memorized templates alone.
Find a part from a percent and whole
Problem
Use a percent proportion to find \(35\%\) of \(80\).
Big Picture
What this problem is really about
Here the whole is known and the missing quantity is the part. Place that unknown part over the whole, and match it to the given percent written over one hundred. Solving the equivalent ratios finds the part, while a quick estimate—slightly more than one third of the whole—checks whether its size is sensible.
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