Splash Screen. Lesson Menu Five-Minute Check (over Lesson 2–2) Main Idea and Vocabulary Key Concept: Multiply Fractions Example 1:Multiply Positive Fractions.

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Presentation transcript:

Splash Screen

Lesson Menu Five-Minute Check (over Lesson 2–2) Main Idea and Vocabulary Key Concept: Multiply Fractions Example 1:Multiply Positive Fractions Example 2:Multiply Negative Fractions Example 3:Multiply Mixed Numbers Example 4:Real-World Example Example 5:Use Dimensional Analysis

Main Idea/Vocabulary dimensional analysis Multiply positive and negative fractions. The process of including units of measurement when you compute.

KC Animation: Multiplying Fractions

Example 1 Multiply Positive Fractions Answer: Simplify. Multiply the numerators. Multiply the denominators. Divide 3 and 9 by their GCF,

1.A 2.B 3.C 4.D Example 1 A. B. C. D.

Example 2 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:

1.A 2.B 3.C 4.D Example 2 A. B. C. D.

Example 3 Multiply Mixed Numbers Divide 16 and 4 by their GCF, 4. Multiply the numerators. Multiply the denominators. Estimate 3 × 2 = 6.

Example 3 Multiply Mixed Numbers Answer: Simplify. Compare to the estimate.

1.A 2.B 3.C 4.D Example 3 A. B. C. D.

Example 4 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.

Example 4 Answer: The 8th graders did 300 hours of community service last summer.

1.A 2.B 3.C 4.D Example 4 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?

Example 5 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

Example 5 Divide by common factors and units. Use Dimensional Analysis

Example 5 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.

1.A 2.B 3.C 4.D Example 5 A.15 gallonsB. 38 gallons C.775 gallonsD. 897 gallons

End of the Lesson

Resources Five-Minute Check (over Lesson 2–2) Image Bank Math Tools Multiplying Fractions Multiplying and Dividing Fractions

1.A 2.B 3.C Five Minute Check 1 A.< B.> C.= (over Lesson 2-2) Use, or = to make a true sentence.

1.A 2.B 3.C Five Minute Check 2 A.< B.> C.= (over Lesson 2-2) Use, or = to make – –4.46 a true sentence.

1.A 2.B 3.C Five Minute Check 3 A.< B.> C.= (over Lesson 2-2) Use, or = to make a true sentence.

1.A 2.B 3.C 4.D Five Minute Check 4 (over Lesson 2-2) A. B. C. D.

1.A 2.B 3.C 4.D Five Minute Check 5 (over Lesson 2-2) A. B. C. D.

1.A 2.B 3.C 4.D Five Minute Check 6 Which number is least? (over Lesson 2-2) A. B.0.83 C. D.0.61

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