# Math in Focus Grade 3 Cumulative Review Chapters 6 and 7 Answer Key

Go through the Math in Focus Grade 3 Workbook Answer Key Cumulative Review Chapters 6 and 7 to finish your assignments.

## Math in Focus Grade 3 Cumulative Review Chapters 6 and 7 Answer Key

Concepts and Skills

Fill in the blanks. (Lessons 6.1 to 6.5)

Question 1.
___ × 8 = 0
0× 8 = 0.

Explanation:
Here, if we multiply 0 with 8 then we will get the result as 0.

Question 2.
___ × 1 = 7
7 × 1 = 7.

Explanation:
Here, if we multiply 7 with 1 then we will get the result as 7.

Question 3.
9 sixes = 9 × ___
9 × 6 = 56.

Explanation:
Here 9 sixes are 9 × 6 which is 54.

Question 4.
4 × 7 = ___ sevens
4 × 7 =4 sevens.

Explanation:
The multiplication of 4 and 7 is 28 which is 4 sevens.

Question 5.
3 × 6 = 6 + 6 + ___
3 × 6 = 6 + 6 + 6.

Explanation:
Here, 3 × 6  is 18 and the addition will be 6+6+6 which is 18.

Question 6.
7 × 6 = 6 × ___
7 × 6 = 6 × 7.

Explanation:
Here, by using commutative property we can write 7 × 6  as 6 × 7. As commutative property allows two or more factors to be multiplied in any order without changing the product. So 7 × 6 = 6 × 7.

Question 7.
9 × ___ = 0
9 × 0 = 0.

Explanation:
Anything if we multiply with 0 we will get the result as 0. So 9 × 0 is 0.

Question 8.
8 + 8 + 8 + 8 + 8 = 5 × ___
8 + 8 + 8 + 8 + 8 = 5 × 8.

Explanation:
Here, the addition of 8 + 8 + 8 + 8 + 8 which is 40, so 5 × 8 is 40.

Question 9.
5 nines + 3 nines = __ × 9
5 nines + 3 nines = 8 × 9.

Explanation:
Here, 5 nines + 3 nines are (5×9) + (3×9) which is 8×9.

Question 10.
9 + 9 + 9 + 9 = ___ nines
9 + 9 + 9 + 9 = 4 nines.

Explanation:
Here, the addition of 9 + 9 + 9 + 9 is 36 which is 4 nines.

Complete each multiplication fact.
Then show on the number line. (Lessons 6.1 and 6.4)

Question 11.
2 × 4 × 3 = ?

2×4×3 = 24.

Explanation:

Here, in the first step, we have performed multiplication for 2×4 which is 8, and in the second step, we have performed multiplication for 8×3  which is 24. So 2×4×3 is 24.

Question 12.
2 × 4 × 3 = ?

2×4×3 = 24.

Explanation:

Here, in the first step, we have performed multiplication for 4×3 which is 12, and in the second step, we have performed multiplication for 2×12  which is 24. So 2×4×3 is 24.

Multiply. Use multiplication facts you know to find other multiplication facts. (Lessons 6.3 and 6.5)

Question 13.
5 × 7 = ___
So, 6 × 7 = ___ groups of 7 + ___ group of 7
= ___ + ____
= _____
5 × 7 = 35
So, 6 × 7 = 5 groups of 7 + 1 group of 7
= 35 + 7
= 42.

Explanation:
Here, 5 × 7  is 35, and 6 × 7 is 42 which is
5 groups of 7 + 1 group of 7
= 35+7
= 42.

Question 14.
10 × 9 = ___
So, 8 × 9 = ___ groups of 9 – ___ groups of 9
= ____ – ____
= _____

10 × 9 = 90.
So, 8 × 9 = 10 groups of 9 – 2 groups of 9
= 90-18
= 72.

Explanation:
Here, 10 × 9 is 90, and 8 × 9 is 72 which is
10 groups of 9 – 2 groups of 9
= 90-18
= 72.

Write two related division sentences. (Lessons 6.3, 6.4, 6.5 and 6.6)

Question 15.
8 × 4 = ____
____ ÷ ___ = ____
____ ÷ ___ = ____
8 × 4 = 32,
32 ÷ 4 = 8,
32 ÷ 8 = 4.

Explanation:
Given that 8 × 4 which is 32.
Here, 32 ÷ 4 is 8 and
32 ÷ 8 is 4.

Question 16.
_____ × ___ = ____
54 ÷ ___ = 9
____ ÷ ___ = ____
6×9 = 54,
54 ÷ 6 = 9,
54 ÷ 9 = 6.

Explanation:
Let the blank space be X, so 54 ÷ X = 9
and X will be 54 ÷ 9 = 6. So the X is 6,
54 ÷ 6 = 9 and
54 ÷ 9 = 6.
So the multiplication will be 6×9 = 54.

Multiply. Fill in the missing numbers. (Lesson 7.1)

Question 17.
4 × 9 = ___
4 × 90 = 4 × ___ tens
= ____ tens
= ____
360.

Explanation:
As 4 × 9 is 36,
4 × 90 = 4 × 9 tens,
= 36 tens,
= 360.

Question 18.
10 × 7 = ___
10 × 700 = 10 × ___ hundreds
= ___ hundreds
= ____
700.

Explanation:
10 × 7 = 70
10 × 700 = 10 × 7 hundreds
= 7 hundreds
= 700.

Multiply. Use mental math. (Lesson 7. 7)

Question 19.
10 × 3 = ____
10 × 3 = 30.

Explanation:
As 1 × 3 is 3 and the mental math of 10 × 3 is 30.

Question 20.
5 × 10 = ____
5 × 10 = 50.

Explanation:
As 5 × 1 is 5 and the mental math of 5 × 10 is 50.

Question 21.
20 × 4 = ___
20 × 4 = 80.

Explanation:
As 2 × 4 is 8 and the mental math of 20 × 4 is 80.

Question 22.
3 × 40 = ___
3 × 40 = 120.

Explanation:
As 3 × 4 is 12 and the mental math of 3 × 40 is 120.

Question 23.
500 × 2 = ____
500 × 2 = 1,000.

Explanation:
As 5 × 2 is 10 and the mental math of 500 × 2 is 1,000.

Question 24.
4 × 200 = __
4 × 200 = 800.

Explanation:
As 4 × 2 is 8 and the mental math of 4 × 200 is 800.

Multiply. Show your work. (Lessons 7.2 and 7.3)

Question 25.
212 × 4 = ___

212 × 4 = 848.

Explanation:
The multiplication of 212 × 4 is 848.

Question 26.
148 × 5 = ___

148 × 5 = 740.

Explanation:
The multiplication of 148 × 5 is 740.

Question 27.

432 × 2 = 864.

Explanation:
The multiplication of 432 × 2 is 864.

Question 28.

251 × 3 = 753.

Explanation:
The multiplication of 251 × 3 is 753.

Problem Solving

Question 29.
Cheryl completes 42 pages of math exercises. There are 4 exercises on each page. How many exercises does she complete?
The number of exercises does she completes is 168 exercises.

Explanation:
Given that Cheryl completes 42 pages of math exercises and there are 4 exercises on each page. So the number of exercises does she completes is 42×4 which is 168 execises.

Question 30.
Damien has 48 marbles. He packs all the marbles equally into 8 bags. How many marbles are there in each bag?

The number of marbles is there in each bag is 384 marbles.

Explanation:
Given that Damien has 48 marbles and he packs all the marbles equally into 8 bags. So the number of marbles are there in each bag is 48 × 8 which is  384 marbles.

Question 31.
Mr. Roberts has 63 daisies and some pots. He plants 9 daisies in each pot. How many pots does he use?
The number of pots does he uses is 7 pots.

Explanation:
Given that Mr. Roberts has 63 daisies and some pots and he plants 9 daisies in each pot. So the number of pots does he uses is 63 ÷ 9 which is 7 pots.

Question 32.
A farmer packs 49 pounds of grain into 7-pound bags. How many bags does the farmer need?
The number of bags does the farmer need is 7 bags.

Explanation:
Given that a farmer packs 49 pounds of grain into 7-pound bags. So the number of bags does the farmer need is 49 ÷ 7 which is 7 bags.

Question 33.
A grocer sells 153 bags of carrots. Each bag has 5 carrots. How many carrots does the grocer sell?