Grade 6 · Math · Lesson 11

Solve Proportions

A proportion is a statement that two ratios are equal. We write it with an equals sign between two fractions: 2/3 = 8/12. When one of the four numbers is missing, we can solve for it using a powerful shortcut called cross-multiplication.

What this lesson teaches

1Recognize a proportion as two equal ratios joined by an equals sign
2Apply cross-multiplication to find the missing value in a proportion
3Verify a solved proportion by checking that the cross products are equal
4Use proportions to solve real-world problems involving equivalent ratios

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