7.1 Ratios and Proportions. 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…

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Presentation transcript:

7.1 Ratios and Proportions

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…

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

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

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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.

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

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