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Section 3.8 Ratios & Rates Made Easy Mr. Beltz & Mr. Sparks Ratio A ratio is a comparison of a number “A” to another number “B” using division. Three ways to express a ratio A to B A:B A B Ways to write Ratio’s PART 1 = .25 or 25% WHOLE 4 or PART : WHOLE 1: 4 = 25% Proportions A proportion is an equation stating that two ratios are equivalent. It can be written in two ways: 4:8 = 8:16 Or 4= 8 8 16 (8 * 8 =64) (4 * 16 = 64) Solving for Variables 4= 8 8 X 4x = 8 * 8 4x = 64 4x = 64 4 4 x = 16 Practice: Mental Math 2=6 5 X 8=4 x 3 3=X 4 20 Using Units Important! Always keep the units lined up! Example: 1 cm : 4 m 12 cm : X m CM M 1 cm = 12 cm 4m Xm Using Units Important! Always keep the units lined up! Example: 1 cm : 4 m 12 cm : X m CM M 1 cm = 12 cm 4m Xm x = 12 * 4 x=48