Proportions and Non-Proportions
Common Core: 7.RP.2a

Proportions and Non-Proportions

Author: Graham Pardun
This lesson defines proportions and non-proportions.
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Proportions Are Equations With Ratios On Both Sides of the Equal Sign

Here's a brief intro on what proportions are, why they are awesome, and how to spot non-proportions posing as proportions.