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# Mental Math to Solve Proportions

## Solve proportions by comparing numerators and denominators of equal fractions.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Video

## Introduction to Proportions

by CK-12 //basic

Introduces the basic vocabulary and properties of proportions.

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• Video

## Find an Unknown in a Proportion

by CK-12 //basic

Learn how to solve proportions for a variable.

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