1. R ATIOS, R ATES & P ROPORTIONS Chapter 4

2. V OCABULARY Ratio- A comparison of two numbers by division. Can be written as: a : b a b Rate- when a and b of a ratio represent quantities measured in different units. The numerator is one unit, the denominator is a different unit. Unit Rate- When the denominator of a rate is 1.

3. W ORD P ROBLEM In 2001, Lance Armstrong won the Tour de France, completing the 3,454 km course in about 86.3 hours. Traveling at his average speed, how long would it take him to ride 185 km? Round your answer to the nearest tenth. Work in partners to figure this out.