All the solutions provided inÂ **McGraw Hill My Math Grade 3 Answer Key PDF Chapter 7 Review **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 3 Chapter 7 Review Answer Key

**Vocabulary Check**

Use the word bank below to complete each clue.

decompose Identity Property of Multiplication

inverse operations known fact Zero Property of Multiplication

Question 1.

The ____ says that when any number is multiplied by 1, the product is that number.

Answer:

The Identity property of Multiplication says that when any number is multiplied by 1, the product is that number.

Question 2.

A ____ is a fact you have memorized.

Answer:

A known fact is a fact you have memorized.

Question 3.

Multiplication and division are ________ because they undo each other.

Answer:

Multiplication and division are the inverse operation because they undo each other.

Question 4.

____ means to take a number apart.

Answer:

The decompose means to take a number apart.

Question 5.

The ____ says that when you multiply a number by 0, the product is zero.

Answer:

The Zero Property of Multiplication says that when you multiply a number by 0, the product is zero.

**Concept Check**

**Algebra Use a related multiplication fact to find the unknown.**

Question 6.

16 Ă· 4 =

4 Ă— = 16

The unknown is ___.

Answer:

16 divided by 4 equal 4.

16 Ă· 4 = 4.

Multiplication of 4 with 4 then you get 16.

4 x 4 = 16.

The unknown is 4.

Question 7.

24 Ă· 3 =

3 Ă— = 24

The unknown is ___.

Answer:

24 divided by 3 equal to 8

24 Ă· 3 = 8.

Multiplication of 3 with 8 then you get 24.

3 x 8 = 24.

The unknown is 8.

Question 8.

20 Ă· 4 =

4 Ă— = 20

The unknown is ___.

Answer:

20Â divided by 4 equal to 5

20 Ă· 4 = 5.

Multiplication of 4 with 5 then you get 20.

4 x 5 = 20.

The unknown is 5

**Use counters to model a known fact that will help you find the first product. Draw the model two times.**

Question 9.

6 Ă— 6 = ____

Known fact:

____ Ă— _____

Double the product:

____ + ____ = ____

Answer:

Multiplication of 6 with 6 then you get 36.

6 x 6 = 36.

Know fact is 6 x 6 = 36

36 is the product.

Double the product is 36 + 36 = 72.

Question 10.

7 Ă— 4 = ____

Known fact:

____ Ă— _____

Double the product:

____ + ____ = ____

Answer:

Multiplication of 7 with 4 then you get 28.

7 x 4 = 28.

The Known fact is 7 x 4 = 28.

28 is the product.

Double the product is 28 + 28 = 56.

**Algebra Find each unknown. Double a known fact.**

Question 11.

7 Ă— 6 =

The unknown is ____.

Answer:

Multiplication of 7 with 6 then you get 42.

7 x 6 = 42.

The unknown is 42.

Question 12.

9 Ă— 4 =

The unknown is ____.

Answer:

Multiplication of 9 with 4 then you get 36.

9 x 4 = 36.

The unknown is 36.

**Write an addition sentence to help find each product.**

Question 13.

6 Ă— 1 = ____

1 + 1 + ___ + ___ + ___ + ___ = _____

Answer:

Multiplication of 6 with 1 then you get 6.

6 x 1 = 6.

The additional sentence is

1 + 1 + 1 + 1 + 1 + 1 = 6.

Question 14.

7 Ă— 1 = ____

1 + 1 + 1 + ___ + ___ + ___ + ____ = ____

Answer:

Multiplication of 7 with 1 then you get 7.

7 x 1 = 7.

The additional sentence is

1 + 1 + 1 + 1 + 1 + 1 + 1 = 7.

**Use the Zero Property of Multiplication to find each product.**

Question 15.

7 Ă— 0 = ____

Answer:

In the zero property of multiplication any number multiplied by 0 then you get 0.

Multiplication of 7 with 0 then you get 0.

7 x 0 = 0.

Question 16.

9 Ă— 0 = ___

Answer:

In the zero property of multiplication any number multiplied by 0 then you get 0.

Multiplication of 9 with 0 then you get 0.

9 x 0 = 0.

Question 17.

6 Ă— 0 = ___

Answer:

In the zero property of multiplication any number multiplied by 0 then you get 0.

Multiplication of 6 with 0 then you get 0.

6 x 0 = 0.

**Write a division sentence as an example of each division rule.**

Question 18.

When a number is divided by 1, the quotient is that number. _____

Answer:

As per the division rule when a number is divided by 1, the quotient is that number itself.

Example is 6 Ă· 1 = 6.

Question 19.

When a number is divided by itself, the quotient is 1. _____

Answer:

As per the division rule when a number is divided by itself, the quotient is 1.

For example 6 Ă· 6 = 1.

Question 20.

When 0 is divided by a nonzero number, the quotient is 0. ____

Answer:

As per the division rule when 0 is divided by a nonzero number, the quotient is 0.

For example 0 Ă· 6 = 0.

**Problem Solving**

Question 21.

There are a total of 12 slices of pizza. Each pizza is cut into 4 slices. How many pizzas are there? Write a number sentence to solve.

Answer:

Given that,

The total number of pizza slices is 12.

Each pizza is cut into 4 slices.

The number of pizzas is 12 Ă· 4 = 3.

Therefore the number of pizzas is 3.

The number sentence is 12 Ă· 4 = 3.

Question 22.

A van has 4 rows of seats, and each row holds 3 people. How many people can the van hold? Write a number sentence to solve.

Answer:

Given that,

A van has 4 rows of seats.

Each row holds 3 people.

The number of people that the van holds is 4 x 3 = 12.

The number sentence is 4 x 3 = 12.

Therefore the number of people in the van is 12.

Question 23.

Mika rides his bike 3 miles each way to his friend’s house. He leaves his house at 4 P.M. How many miles does he ride his bike there and back? What information is extra?

Answer:

Given that,

Mika rides his bike 3 miles each way to his friend’s house.

The number of miles he rides his bike there and back is 3 + 3 = 6 miles.

The extra information is He leaves his house at 4 P.M.

Question 24.

Four campers divide 24 large marshmallows. Each s’more uses 2 marshmallows. How many s’mores can each camper have?

Answer:

Given that,

Four campers divide 24 large marshmallows.

The number of marshmallows in 1 camper is 24 Ă· 4 = 6.

Each s’more uses 2 marshmallows.

The number of s’mores each camper can have is 6 Ă· 2 = 3.

Therefore the s’mores each camper can have is 3.

**Test Practice**

Question 25.

Mr. Thompson bought 3 of the same item. He paid a total of $21. Which item did he buy?

Answer:

Given that,

Mr. Thompson bought 3 of the same item.

He paid a total of $21

He buys the Option B item.

Because $7 x 3 = $21.

Option B is the correct answer.

**Reflect**

Use what you learned about multiplication and division to complete the graphic organizer.

Reflect on the ESSENTIAL QUESTION ? Write your answer below.

Answer: