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# Proportions to Find Base b

## Cross - multiply to find a missing part of a proportion, base, b.

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.

## Proportions to Find Base b

Explains how to use proportions and cross products to solve for the base as well as the percent and the amount.

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## Proportions to Find Base b

Use the cross products of proportions to find base b in percent problems.

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## Precent Problems (Using Proportions & Equations)

Use the cross products of proportions to find base b in percent problems.

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• PLIX

## Proportions to Find Base: Tiled Floor

Proportions to Find Base b Interactive

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• Practice
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