2. Main Idea and New Vocabulary NGSSS
Key Concept: Inverse Property of Multiplication
Example 1: Find a Multiplicative Inverse
Key Concept: Divide Fractions
Example 2: Divide Fractions and Mixed Numbers
Example 3: Divide Fractions and Mixed Numbers
Example 4: Real-World Example
Five-Minute Check
Lesson Menu

3. Divide rational numbers.
multiplicative inverses
reciprocals
Main Idea/Vocabulary

4. MA.8.A.6.4 Perform operations on real numbers (including integer exponents, radicals, percents, scientific notation, absolute value, rational numbers, and irrational numbers) using multi-step and real world problems.
NGSSS

5. Key Concept

6. Find a Multiplicative Inverse
Write the multiplicative inverse of
Write as an improper fraction.
Since the multiplicative inverse of is
Answer:
Example 1

7. Write the multiplicative inverse of – .B. C. D.
Example 1 CYP

8. Key Concept 3

9. Divide Fractions and Mixed Numbers
Find Write in simplest form.
The multiplicative inverse of
Divide –2 and 8 by their GCF, 2. =
Multiply.
Answer:
Example 2

10. Find . Write in simplest form.A. B. C. D.
Example 2 CYP

11. Divide Fractions and Mixed Numbers
Find Write in simplest form.
The multiplicative inverse of
Divide 4 and 8 by their GCF, 4.
Example 3

12. Divide Fractions and Mixed Numbers
Multiply.
Answer:
Example 3

13. Find . Write in simplest form.A. B.
C. 8
D. 36
Example 3 CYP

14. TELEVISION A television station shows a holiday movie repeatedly for hours. It takes 150 minutes to show the movie with commercial breaks. How many times does the television station show the movie that day?
Example 4

15. Multiply to convert 150 minutes to hours.
Divide by common factors and units.
Multiply.
Example 4

16. Multiply by the multiplicative inverse of which is Divide by common factors.
Example 4

17. Answer: The television station shows the movie 5 times.
Simplify.
Answer: The television station shows the movie 5 times.
Example 4

18. COSTUMES Each elf costume for the school play requires yards of fabric
COSTUMES Each elf costume for the school play requires yards of fabric. How many elf costumes can be made from a bolt of fabric that contains 13 yards?
A. 5 costumes
B. 8 costumes
C. 13 costumes
D. 21 costumes
Example 4 CYP

19. Find the multiplicative inverse of 9.B.
C. 0 D.
Five Minute Check 1

20. Find the multiplicative inverse of .B. C. D.
Five Minute Check 2

21. Find . Write in simplest form.A. B. C. D.
Five Minute Check 3

22. Find . Write in simplest form.A. B. C. D.
Five Minute Check 4

23. Find . Write in simplest form.
A. –1
B. 1 C. D.
Five Minute Check 5

24. A salad dressing requires cup of oil and cup of vinegar per serving
A salad dressing requires cup of oil and cup of vinegar per serving. How much oil is in a half serving?
A. cup C. cup
B. cup D. 1 cup
Five Minute Check 6