1. 7.1 Ratios and Proportions

2. Ratios Ratio: A comparison of two quantities by division. 1) The ratio of a to b 2) a : b Ratios can be written in three ways…

3. 5 in. Ratios 6 in. 1 2/3 ft. 2 ft. Find the ratio of the width of the photo to the poster.

4. Proportions Proportion: A statement that two ratios are equal. Determine if each of the following pairs of ratios are equal. = ≠=

5. Proportions Properties of Proportions: is equivalent to… Cross-Product Property: The product of the extremes is equal to the product of the means.

6. If, complete each statement. Applying Properties

7. Solving Proportions Solve the following proportions.

8. Ratios Scale: The ratio of any length in a scale drawing to the corresponding actual length. Ex. 1cm to 1ft or 1in = 10ft or 1mm : 100mi An inch ruler shows that l = 7/8 in. Find the actual length of the bedroom.

9. Ratios Scale Drawing Activity!!! 20 point QUIZ grade #1-5 worth 2 points each #6 worth 10 POINTS! No more than 4 in a group Must set up a proportion for each problem Show all work on every problem Answers must have the correct units of measure

10. 7.1 Ratios and Proportions Homework #1 Pg 368 #2, 3-21 odd, 27, 30, 31, 35-43 odd