Five-Minute Check (over Lesson 2–3)

Main Idea and Vocabulary

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

Example 5:Real-World Example

• multiplicative inverses

• reciprocals

• Divide positive and negative fractions.

Two numbers with a product of 1

15

BrainPop:Multiplying and Dividing Fractions

Find a Multiplicative Inverse

Answer:

1. A

2. B

3. C

4. D0% 0%0%0%

A.

B.

C.

D.

Divide Fractions and Mixed Numbers

The fractions have different signs, so the quotient is negative.

Answer:

Multiply by the multiplicative

1. A

2. B

3. C

4. D0% 0%0%0%

A.

B.

C.

D.

Divide Fractions and Mixed Numbers

The multiplicative

inverse of

Divide 4 and 8 by their GCF, 4.

Estimate 3 ÷ (–2) = –1.5

Simplify.

Divide Fractions and Mixed Numbers

Check for Reasonableness

Compare to the estimate. The answer seems reasonable

because –1.5 is close to

Answer:

1. A

2. B

3. C

4. D0% 0%0%0%

A.

B.

C.

D.

Divide by common factors.

= 5 Simplify.

Answer: The cinema shows the movie 5 times that day.

1. A

2. B

3. C

4. D

0% 0%0%0%

A. 4 times

B. 5 times

C. 6 times

D. 7 times

PAINTING It took the five members of the Johnson

family 10 days to paint the seven rooms of their

house. At this rate, how long will it take the four

members of the Reyes family to complete a similar

task in their house?

If 5 persons each worked days, the project required

person-days of work. Divide this number by

4 persons to find the number of days it will take the Reyes

family to complete their painting.

Multiply by the multiplicative inverse of 4,

which is .

Simplify.

Answer:

1. A

2. B

3. C

4. D

0% 0%0%0%

DECORATING Six students spent hours

decorating the school gym for a dance. How long would it take 8 students to decorate the gym in the same way?

A.

B.

C.

D.

End of the Lesson

Five-Minute Check (over Lesson 2–3)

Image Bank

Math Tools

Multiplying Fractions

Multiplying and Dividing Fractions

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 2-3)

A.

B.

C.

D.

Find Write in simplest form.

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 2-3)

A.

B.

C.

D.

Find Write in simplest form.

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 2-3)

A.

B.

C.

D.

Find Write in simplest form.

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 2-3)

A.

B.

C.

D.

Find Write in simplest form.

1. A

2. B

3. C

4. D0% 0%0%0%

(over Lesson 2-3)

A.

B.

C.

D.

1. A

2. B

3. C

4. D0% 0%0%0%

Which of the following is 0.032 written as a fraction in simplest form?

(over Lesson 2-3)

A. 3.2

B.

C.

D.