8-1 R ATIOS AND P ROPORTIONS M11.C.1 2.8.11.D Objectives: 1) To write ratios and solve proportions.

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8-1 R ATIOS AND P ROPORTIONS M11.C D Objectives: 1) To write ratios and solve proportions

V OCABULARY Ratio – a comparison of two quantities Written as 1. a to b 2. a : b Reading Math: You can read a : b as “the ratio a to b”

E XAMPLES : R EAL W ORLD C ONNECTIONS A scale model of a car is 4 inches long. The actual car is 15 feet long. What is the ratio of the length of the model to the length of the car?

V OCABULARY

P ROPERTIES OF P ROPORTIONS

C ROSS -P RODUCT PROPERTY

E XAMPLES : P ROPERTIES OF P ROPORTIONS

S OLVING P ROPORTIONS

S CALE D RAWING A scale compares each length in a drawing to the actual length. Example: Two cities are 3.5 inches apart on a map with the scale 1 in = 50 miles. Find the actual distance.