1. Key Concept Animation: Multiplying Fractions

2. Lesson 3 Ex1 Multiply Positive Fractions Divide 3 and 9 by their GCF, 3. Answer: Simplify. Multiply the numerators. Multiply the denominators.

3. A.A B.B C.C D.D Lesson 3 CYP1 A. B. C. D.

4. Lesson 3 Ex2 Multiply Negative Fractions Divide –3 and 12 by their GCF, 3. The numerator and denominator have different signs, so the product is negative. Multiply the numerators. Multiply the denominators. Answer:

5. Lesson 3 CYP2 1.A 2.B 3.C 4.D A. B. C. D.

6. Lesson 3 Ex3 Multiply Mixed Numbers Divide 16 and 4 by their GCF, 4. Multiply the numerators. Multiply the denominators.

7. Lesson 3 Ex3 Multiply Mixed Numbers Answer: Simplify. Compare to the estimate.

8. 1.A 2.B 3.C 4.D Lesson 3 CYP3 A. B. C. D.

9. Lesson 3 Ex4 Multiply Mixed Numbers VOLUNTEER WORK Last summer, the 7th graders performed a total of 250 hours of community service. If the 8th graders spent this much time volunteering, how many hours of community service did the 8th graders perform? The 8th graders spent the amount of time as the 7th graders on community service.

10. Lesson 3 Ex4 Multiply Mixed Numbers Answer: The 8th graders did 300 hours of community service last summer.

11. A.A B.B C.C D.D Lesson 3 CYP4 A.175 hoursB. 190 hours C.200 hoursD. 225 hours VOLUNTEER WORK Last summer, the 5th graders performed a total of 150 hours of community service. If the 6th graders spent this much time volunteering, how many hours of community service did the 6th graders perform?

12. Lesson 3 Ex5 Use Dimensional Analysis WATER USE Low–flow showerheads use gallons of water per minute. If family members shower a total of hours per week, how much water does the family use for showers each week? WordsWater used equals the time multiplied by the water flow rate. VariableLet w represent the gallons of water used. Equation

13. Lesson 3 Ex5 Divide by common factors and units. Use Dimensional Analysis

14. Lesson 3 Ex5 Use Dimensional Analysis Answer: If the family showers hours per week at a rate of gallons per minute, they will use 350 gallons of water.

15. A.A B.B C.C D.D Lesson 3 CYP5 A.15 gallonsB. 38 gallons C.775 gallonsD. 897 gallons