1. P REREQUISITE S KILLS ON R ATIOS

2. I N THE REAL WORLD Baseball How can you compare a baseball team’s wins to its losses during spring training? A ratio uses division to compare two numbers. There are three ways to write a ratio of two numbers.

3. W RITING A RATIO All three ways of writing the ratio of two numbers are read “the ratio of a to b,” so 18 : 13 is read “the ratio of eighteen to thirteen.” Two ratios are equivalent ratios when they have the same value.

4. E XAMPLE 1 W RITING A RATIO 1. You can make comparisons about games played by the Cubs. a. Wins to losses wins = 17, losses = 14 Answer: _______ b. Wins to games played wins = 17, games = 17 + 14 = 31 Answer: _________

5. Y OUR T URN Use the table above to write the ratio for the Padres. 1. Wins to losses 2. Wins to games played 3. Losses to wins

6. E XAMPLE 2 W RITING RATIOS IN SIMPLEST FORM Amusement Parks A ride on a roller coaster lasts 2 minutes. Suppose you wait in line for 1 ½ hours to ride the roller coaster. Follow the steps below to find the ratio of time spent in line to time spent on the ride. -Write hours as minutes so that the units are the same. -Write the ratio of time spent in line to time spent on the ride.

7. E XAMPLE 3 C OMPARING R ATIOS Music: Luis and Amber compared their CD collections. To determine who has a greater ratio of rock CDs to pop CDs, write the ratios. 1. Write ratios as fractions (rock/pop). 2. Write fractions as decimals and compare. Luis: Amber:

8. Y OUR TURN 1. Does Luis or Amber have a greater ratio of pop CDs to hip-hop CDs? 1. Does Luis or Amber have a greater ratio of hip- hop CDs to rock CDs?