Understanding Proportions

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Presentation transcript:

Understanding Proportions LESSON 7-3 Additional Examples Do the ratios in each pair form a proportion? a. , 42 77 6 14 3 13 9 39 b. ,  7  3 42 77 6 14 3 13 9 39 14  7 = 98, not 77 Compare ratios. 42 77 6 14 = / Compare ratios. 3 13 9 39 = and do not form a proportion. 42 77 6 14 and form a proportion. 3 13 9 39

Understanding Proportions LESSON 7-3 Additional Examples In one class, 2 out of 16 students’ favorite subject is math. In another class, 4 out of 12 students’ favorite subject is math. Are these ratios equal? Write ratios for each class. 4 math students 12 total students 2 math students 16 total students 4 ÷ 4 12 ÷ 4 1 3 8 Simplify. 2 ÷ 2 16÷ 2 1 The ratios are not equal. 3 1 8