1. 2.5 Solving Proportions Write and use ratios, rates, and unit rates. Write and solve proportions.

2. A ratio is a comparison of two quantities. A ratio can be written as

3. Example: Reduce Ratios

4. Practice

5. A rate is a ratio of two quantities with different units. A unit rate is a rate with a second quantity of 1 unit. You can convert any rate into a unit rate.

6. Example: Divide Rates

7. Practice

8. A statement that two ratios are equal is called a proportion. You can solve a proportion by using the cross products property, then an inverse operation.

9. Example: Cross Multiply, Divide

10. Practice

11. A percent is a ratio that compares a number to 100. You can use the following proportion to find unknown values.

12. Examples

13. Practice

14. Proportions are used to create scale drawings and scale models. A scale is a ratio between two sets of measurements. A scale drawing or scale model uses a scale to represent an object as smaller or larger than the actual object.

15. Example

16. REVIEW 1)What is a ratio? 2)What is a rate? 3)What is a proportion? 4)What is a scale drawing?