Splash Screen. Lesson Menu Five-Minute Check (over Lesson 2–2) Main Idea and Vocabulary Key...
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Transcript of Splash Screen. Lesson Menu Five-Minute Check (over Lesson 2–2) Main Idea and Vocabulary Key...
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
• dimensional analysis
• Multiply positive and negative fractions.
The process of including units of measurement when you compute.
Multiply Positive Fractions
Answer:
Simplify.
Multiply the numerators.Multiply the denominators.
Divide 3 and 9 by their GCF, 3.3
1
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:
Multiply Mixed Numbers
Divide 16 and 4 by their GCF, 4.
Multiply the numerators.Multiply the denominators.
Estimate 3 × 2 = 6.
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.
1. A
2. B
3. C
4. D0% 0%0%0%
A. 175 hours B. 190 hours
C. 200 hours D. 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?
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?
Words Water used equals the time multiplied by the water flow rate.
Variable Let w represent the gallons of water used.
Equation
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.
Five-Minute Check (over Lesson 2–2)
Image Bank
Math Tools
Multiplying Fractions
Multiplying and Dividing Fractions
1. A
2. B
3. C0% 0%0%
A. <
B. >
C. =
(over Lesson 2-2)
Use <, >, or = to make – –4.46 a true sentence.