Ratios & Percentages Introduction

Ratios, proportions, and percentages are all about comparing and measuring stuff. They can help us measure popularity, or find how rare something might be, or figure out a discount at our favorite store.

A ratio compares any two numbers, like the number of students who can do standing backflips to the number of students who can't. A proportion compares two equivalent ratios. A percentage compares any number to a total out of 100, like the number of corkscrew flips we landed out of 100 tries.

Whew. We're getting dizzy.