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

Answer:

0× 8 = 0.

Explanation:

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

Question 2.

___ × 1 = 7

Answer:

7 × 1 = 7.

Explanation:

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

Question 3.

9 sixes = 9 × ___

Answer:

9 × 6 = 56.

Explanation:

Here 9 sixes are 9 × 6 which is 54.

Question 4.

4 × 7 = ___ sevens

Answer:

4 × 7 =4 sevens.

Explanation:

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

Question 5.

3 × 6 = 6 + 6 + ___

Answer:

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 × ___

Answer:

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

Answer:

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 × ___

Answer:

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

Answer:

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

Answer:

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 = ?

Answer:

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 = ?

Answer:

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

= ___ + ____

= _____

Answer:

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

= ____ – ____

= _____

Answer:

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 = ____

____ ÷ ___ = ____

____ ÷ ___ = ____

Answer:

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

____ ÷ ___ = ____

Answer:

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

= ____

Answer:

360.

Explanation:

As 4 × 9 is 36,

4 × 90 = 4 × 9 tens,

= 36 tens,

= 360.

Question 18.

10 × 7 = ___

10 × 700 = 10 × ___ hundreds

= ___ hundreds

= ____

Answer:

700.

Explanation:

10 × 7 = 70

10 × 700 = 10 × 7 hundreds

= 7 hundreds

= 700.

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

Question 19.

10 × 3 = ____

Answer:

10 × 3 = 30.

Explanation:

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

Question 20.

5 × 10 = ____

Answer:

5 × 10 = 50.

Explanation:

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

Question 21.

20 × 4 = ___

Answer:

20 × 4 = 80.

Explanation:

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

Question 22.

3 × 40 = ___

Answer:

3 × 40 = 120.

Explanation:

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

Question 23.

500 × 2 = ____

Answer:

500 × 2 = 1,000.

Explanation:

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

Question 24.

4 × 200 = __

Answer:

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 = ___

Answer:

212 × 4 = 848.

Explanation:

The multiplication of 212 × 4 is 848.

Question 26.

148 × 5 = ___

Answer:

148 × 5 = 740.

Explanation:

The multiplication of 148 × 5 is 740.

Question 27.

Answer:

432 × 2 = 864.

Explanation:

The multiplication of 432 × 2 is 864.

Question 28.

Answer:

251 × 3 = 753.

Explanation:

The multiplication of 251 × 3 is 753.

**Problem Solving**

**Solve. Show your work.**

Question 29.

Cheryl completes 42 pages of math exercises. There are 4 exercises on each page. How many exercises does she complete?

Answer:

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?

Answer:

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?

Answer:

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?

Answer:

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?

Answer:

The number of carrots does the grocer sell is 765 carrots.

Explanation:

Given that a grocer sells 153 bags of carrots and each bag has 5 carrots. So the number of carrots does the grocer sell is 153 × 5 which is 765 carrots.

Question 34.

Jessie buys 4 cartons of markers. Each carton contains 125 markers. How many markers does she buy?

Answer:

The number of markers does she bought is 500 markers.

Explanation:

Given that Jessie bought 4 cartons of markers and each carton contains 125 markers. So the number of markers does she bought is 125 × 4 which is 500 markers.