1. Examining Bike Ratios Page 126

2. 96 cm 90 cm 66 cm 1. a)What is described by the ratio 96 : 66 : 90? b)Does the order of the terms in a ratio matter? Explain. 2.96 : 66 : 90 and 48 : 33 : 45 are equivalent ratios. Explain why they are equivalent. 3.a)What other ratios are equivalent to 96 : 66 : 90 ? b)How did you find the equivalent ratios?

3. Karen turns the bike pedal and counts pedal turns while Ellen counts rear wheel turns. They record their results in a table. Copy and complete their table. Number of Pedal Turns Number of Wheel Turns 45 810 12 Use the table to find four ratios equivalent to

4. The girls change to another gear and collect more data. Copy and complete the table. Number of Pedal Turns Number of Wheel Turns 54 10 15 20 Write four more ratios equivalent to 5 : 4 Are 5 : 4 and 4 : 5 equivalent? Explain.

5. Homework Question 4 Write an Equivalent ratio for Each. a.15 : 6 b. c. d.8 : 3 e.5 : 3 : 2 f.8 : 6 : 4 g.15 : 5 : 10 h.1 : 5 : 4

6. Remember from the question that the first thing mentioned is the number of pedal turns and the second term is the number of wheel turns. Make a note of this over your ratio. Each Ratio describes a number of pedal turns to a number of wheel turns. How many turns does each wheel make for 24 pedal turns? Tell what you did. 2 : 3 PW Rewrite the ratio as a fraction. Now set up the other fraction with the missing term represented by ϰ. Remember is it very important that you put the missing term in the right place of the equivalent fraction. The missing term is the wheel turns so it goes as the denominator and the 24 pedal turns goes as the numerator. P W Now cross multiply as usual.

7. Homework Question 5 Each Ratio describes a number of pedal turns to a number of wheel turns. How many turns does each wheel make for 24 pedal turns? Use the example on the previous slide to figure out how many turns the wheel makes for 24 pedal turns for: 3 : 2