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.

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.
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.
A known fact is a fact you have memorized.

Question 3.
Multiplication and division are ________ because they undo each other.
Multiplication and division are the inverse operation because they undo each other.

Question 4.
____ means to take a number apart.
The decompose means to take a number apart.

Question 5.
The ____ says that when you multiply a number by 0, the product is zero.
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 ___.
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 ___.
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 ___.
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:
____ + ____ = ____
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:
____ + ____ = ____
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 ____.
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 ____.
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 + ___ + ___ + ___ + ___ = _____
Multiplication of 6 with 1 then you get 6.
6 x 1 = 6.
1 + 1 + 1 + 1 + 1 + 1 = 6.

Question 14.
7 Ă— 1 = ____
1 + 1 + 1 + ___ + ___ + ___ + ____ = ____
Multiplication of 7 with 1 then you get 7.
7 x 1 = 7.
1 + 1 + 1 + 1 + 1 + 1 + 1 = 7.

Use the Zero Property of Multiplication to find each product.

Question 15.
7 Ă— 0 = ____
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 = ___
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 = ___
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. _____
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. _____
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. ____
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.
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.
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?
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?
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.