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Key Concept

Animation: Multiplying Fractions. Key Concept. Multiply the numerators. Multiply the denominators. Answer:. Multiply Positive Fractions. Divide 3 and 9 by their GCF, 3. Simplify. Lesson 3 Ex1. A. B. C. D. A B C D. Lesson 3 CYP1. Multiply the numerators. Multiply the denominators.

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Key Concept

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  1. Animation:Multiplying Fractions Key Concept

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

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

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

  5. A. B. C. D. • A • B • C • D Lesson 3 CYP2

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

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

  8. A. B. C. D. • A • B • C • D Lesson 3 CYP3

  9. VOLUNTEER WORKLast 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. Multiply Mixed Numbers Lesson 3 Ex4

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

  11. VOLUNTEER WORKLast summer, the 5th gradersperformed a total of 150 hours of community service.If the 6th graders spent this much timevolunteering, how many hours of community servicedid the 6th graders perform? • A • B • C • D A. 175 hours B. 190 hours C. 200 hours D. 225 hours Lesson 3 CYP4

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

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

  14. Answer: If the family showers hours per week at arate of gallons per minute, they will use350 gallons of water. Use Dimensional Analysis Lesson 3 Ex5

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

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