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Ch8 Notes (F09)

Ch8 Notes (F09) - Section 8-1 Ratios Proportions and...

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1 Section 8-1 – Ratios, Proportions, and Proportional Reasoning Suppose that someone tells you that at a particular school, the ratio of students to teachers is 24:1. What does that mean? A ratio is a comparison of two quantities and is usually written b a or a : b. Ratios can represent part-to-part comparisons ie, The ratio of the number of boys to girls is 3:2 Ratios can represent part-to-whole comparisons ie. The ratio of the number of boys to the number of total students is 3:5 Notice that if the ratio of boys to girls is 3:2, that doesn’t tell you the total number of students in the classroom. Example : Find a ratio equivalent to 2:5. Example : Iris has found some dinosaur bones and a fossil footprint. The length of the footprint is 40 cm, the length of the thigh bone is 100 cm, and the length of the body is 700 cm. a) What is the ratio of the footprint’s length to the thigh bone’s length? b) What is the ratio of the footprint’s length to the dinosaur body’s length?

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Ch8 Notes (F09) - Section 8-1 Ratios Proportions and...

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