All the solutions provided in **McGraw Hill My Math Grade 3 Answer Key PDF Chapter 8 Review **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 3 Chapter 8 Review Answer Key

**Vocabulary Check**

**Use the clues and the word bank below to solve the puzzle.**

Commutative known facts pattern related facts

**Across**

1. The 11 s facts show a ____. When a single digit number is multiplied by 11, the product is the digit repeated.

2. Basic facts using the same three numbers. Sometimes called a fact family.

**Down**

3. Facts which you have memorized.

4. The property of multiplication which states that the order in which two numbers are multiplied does not change the product.

Answer:

**Concept Check**

**Algebra Use the inverse operation to find each unknown.**

Question 5.

30 ÷ 6 =

6 × = 30

The unknown is _____.

Answer:

30 divided by 6 equal to 5.

30 ÷ 6 = 5.

The inverse operation is

Multiplication of 6 with 5 then you get 30.

6 x 5 = 30.

The unknown is 5.

Question 6.

28 ÷ 7 =

7 × = 28

The unknown is _____.

Answer:

28 divided by 7 equal to 4.

28 ÷ 7 = 4.

The inverse operation is

Multiplication of 7 with 4 then you get28.

7 x 4 = 28.

Therefore the unknown is 4.

Question 7.

48 ÷ 6 =

6 × = 48

The unknown is _____.

Answer:

48 divided by 6 equal to 8.

48 ÷ 6 = 8.

The inverse operation is.

Multiplication of 6 with 8 then you get 48.

6 x 8 = 48.

Therefore the unknown is 8.

**Double a known fact to find each product. Draw an array.**

Question 8.

8 × 7 = ____

4 × 7 = ___

____ × ___ = ____

28 + ____ = ____

Answer:

Multiplication of 8 with 7 then you get 56.

8 x 7 = 56.

4 x 7 = 28.

Double the known fact is

4 x 7 + 4 x 7 = 8 x 7.

28 + 28 = 56.

The array of 8 x 7 is

Question 9.

6 × 9 = ___

Answer:

Multiplication of 6 with 9 then you get 52.

6 x 9 = 54.

Double the known fact is

6 x 9 + 6 x 9 = 12 x 9

12 x 9 = 108.

Double the product is

54 + 54 = 108.

The array of 6 x 9 is

**Write an addition sentence and a multiplication sentence for each.**

Question 10.

5 rows of 11 counters ___ + ___ + ___ + ___ + ___ = ____

___ × ___ = ____

Answer:

Given that,

5 rows of 11 counters.

So, 5 x 11 = 55.

The addition sentence is 11 + 11 + 11 + 11 + 11 = 55.

Question 11.

6 rows of 12 counters ___ + ___ + ___ + ___ + ___ + ___ = ____

___ × ___ = ____

Answer:

Given that,

6 rows of 12 counters.

So, 6 x 12 = 72.

The addition sentence is 12 + 12 + 12 + 12 + 12 + 12 = 72.

Question 12.

3 rows of 8 counters ___ + ____ + ____ = ____

___ × ___ = ____

Answer:

Given that,

3 rows of 8 counters

So, 3 x 8 = 24.

The addition sentence is 8 + 8 + 8 = 24.

Question 13.

7 rows of 11 counters ___ + ___ + ___ + ___ + ___ + ___ + ___ = ____

___ × ___ = ____

Answer:

Given that,

7 rows of 11 counters.

So, 7 x 11 = 77.

The addition sentence 11 + 11 + 11 + 11 + 11 + 11 + 11 = 77.

**Problem Solving**

Question 14.

Bev notices this heart-shaped button has 4 holes. She needs 11 of these buttons for a project. How many button holes will there be altogether? Write a multiplication sentence to solve.

Answer:

Given that,

The heart shaped button has 4 holes.

She needs 11 of these buttons for a project.

The multiplication sentence is 4 x 11 = 44.

Therefore the total number of buttons are 44.

Question 15.

The array is a model for 5 × 9 = 45. Write the division sentence that is modeled by the array.

Answer:

Multiplication of 5 with 9 then you get 45.

5 x 9 = 45.

The inverse of 5 x 6 = 45 is

45 divided by 5 equal to 9.

45 ÷ 5 = 9.

Question 16.

Chandler works 4 hours each week. How many weeks will it take him to work 36 hours? Write a division sentence to solve.

Answer:

Given that,

Chandler works 4 hours each week.

The number of weeks will it take him to work 36 hours.

The division sentence is 36 ÷ 4 = 9.

Therefore there are 9 weeks to take him to work 36 hours.

Question 17.

Mrs. King took 12 crates packed with lunch boxes on a field trip. Each crate had 6 lunch boxes inside. How many lunch boxes were there altogether? Write a multiplication sentence to solve.

Answer:

Given that,

Mrs. King took 12 crates packed with lunch boxes on a field trip.

Each crate had 6 lunch boxes inside.

The multiplication sentence is

12 x 6 = 72.

Therefore there are 72 lunch boxes.

**Test Practice**

Question 18.

How much will these 4 paperback books cost altogether?

A. $7

B. $14

C. $21

D. $28

Answer:

Given that,

There are 4 paperback books.

The cost of each book is $7.

The cost of 4 paperback books are $7 + $7 + $7 + $7 = $28.

Option D 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: