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Section 4-1 p. 156 Goal – to express ratios as fractions - to determine unit rates
Ratio A ratio is a comparison of two numbers by division. Lets write the ratio of boys to girls in this class.
Your turn 13 red pens out of 25 pens
Rate A rate is a special kind of ratio, a comparison of two quantities with different types of units. 130 miles in 2 hours $5 for 3 pounds
Unit Rate A unit rate is a rate simplified so it has a denominator of 1. 130 miles in 2 hours $5 for 3 pounds
Students Express each ratio in simplest form: 1) 12 missed days in 180 school days 2) 24 pints : 1 quart 3) $50 for 4 days of work 4) 3 feet of snow in 5 hours
Students Express each ratio in simplest form: 5) 12 blue marbles out of 18 6) 10 inches to 2 feet What is the better deal? (better buy?) 7)4 apples for $0.95 or 6 apples for $1.49?
Homework: p. 158 10-25
1/8 AND, OR and NOT b How many boys? b How many girls? b How many blue? b How many red?
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Ratios and Rates. ratio – a comparison of two numbers by division written in several different forms.
A ratio is a comparison of two quantities by division.
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Transparency 1 Click the mouse button or press the Space Bar to display the answers.
6-1 Ratios and Rates. Ratio: a comparison of 2 numbers by division 5 out of 205:205 20 Ratios need to be written in simplest form 5/20 = 1/4.
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