Go through the Math in Focus Grade 6 Workbook Answer Key Chapter 1 Lesson 1.4 Squares and Square Roots to finish your assignments.

## Math in Focus Grade 6 Course 1 A Chapter 1 Lesson 1.4 Answer Key Squares and Square Roots

### Math in Focus Grade 6 Chapter 1 Lesson 1.4 Guided Practice Answer Key

**Find the square of each number.**

Question 1.

2

Answer:

2 x 2 = 4

Explanation:

The square of 2 is 4.

Question 2.

6

Answer:

6 x 6 = 36

Explanation:

The square of 6 is 36.

Question 3.

9

Answer:

9 x 9 = 81

Explanation:

The square of 9 is 81.

Question 4.

11

Answer:

11 x 11 = 121

Explanation:

The square of 11 is 121.

**Find a square root of a perfect square.**

a) A square has an area of 9 square inches. Find the length of each side of the square.

You know that

Area of square = length × length.

To find the length of a side of the square, you need to find the number whose square is 9.

Recalling the multiplication facts of 3, you know that 3 × 3 = 9.

So, the length of each side of the square is 3 inches.

3 is called a square root of 9. This can be written as \(\sqrt{9}\) = 3.

You read this as “the square root of 9 equals 3”.

b) Find the square root of 100.

I can relate this to finding the length of the side of a square, given that it has an area of 1oo units^{2}.

Method 1

Recalling the multiplication facts of 10, you know that

10 × 10 = 100

So, \(\sqrt{100}\) = 10.

Method 2

By prime factorization,

**Find the square root of each number.**

Question 5.

25

Answer:

5

Explanation:

Recalling the multiplication facts of 25, you know that

25 = 5 x 5

= 5²

So, \(\sqrt{25}\) = 5

Question 6.

64

Answer:

8

Explanation:

Recalling the multiplication facts of 64, you know that

64 = 8 x 8

= 8²

So, \(\sqrt{64}\) = 8

Question 7.

144

Answer:

12

Explanation:

Recalling the multiplication facts of 144, you know that

144 = 12 x 12

= 12²

So, \(\sqrt{144}\) = 12

Question 8.

196

Answer:

13

Explanation:

Recalling the multiplication facts of 169, you know that

169 = 13 x 13

= 13²

So, \(\sqrt{169}\) = 13

### Math in Focus Course 1A Practice 1.4 Answer Key

**Find the square of each number.**

Question 1.

3

Answer:

3 x 3 = 9

Explanation:

The square of 3 is 9.

Question 2.

7

Answer:

7 x 7 = 49

Explanation:

The square of 7 is 49.

Question 3.

12

Answer:

144

Explanation:

The square of 12 is 144.

Question 4.

10

Answer:

100

Explanation:

The square of 10 is 100.

**Find the square root of each number.**

Question 5.

36

Answer:

6

Explanation:

Recalling the multiplication facts of 36, you know that

36 = 6 x 6

= 6²

So, \(\sqrt{36}\) = 6

Question 6.

81

Answer:

9

Explanation:

Recalling the multiplication facts of 81, you know that

81 = 9 x 9

= 9²

So, \(\sqrt{81}\) = 9

Question 7.

121

Answer:

11

Explanation:

Recalling the multiplication facts of 121, you know that

121 = 11 x 11

= 11²

So, \(\sqrt{121}\) = 11

Question 8.

49

Answer:

7

Explanation:

Recalling the multiplication facts of 49, you know that

49 = 7 x 7

= 7²

So, \(\sqrt{49}\) = 7

Solve.

Question 9.

List the perfect squares that are between 25 and 100.

Answer:

**Find the value of each of the following.**

Question 10.

35^{2}

Answer:

35 x 35 = 1225

Explanation:

The square of 35 is 1225.

Question 11.

56^{2}

Answer:

56 x 56 = 3136

Explanation:

The square of 56 is 3136.

Question 12.

64^{2}

Answer:

64 x 64 = 4096

Explanation:

The square of 64 is 4096.

Question 13.

\(\sqrt{289}\)

Answer:

17

Explanation:

Recalling the multiplication facts of 289, you know that

289 = 17 x 17

= 17²

So, \(\sqrt{289}\) = 17

Question 14.

\(\sqrt{400}\)

Answer:

20

Explanation:

Recalling the multiplication facts of 400, you know that

400 = 20 x 20

= 20²

So, \(\sqrt{400}\) = 20

Question 15.

\(\sqrt{484}\)

Answer:

22

Explanation:

Recalling the multiplication facts of 484, you know that

484 = 22 x 22

= 22²

So, \(\sqrt{484}\) = 22

**Solve.**

Question 16.

Given that 41^{2} = 1,681, find the square of 410.

Answer:

168100

Explanation:

If 41^{2} = 1,681 then 410^{2} = 168100.

Question 17.

Given that 51^{2} = 2,601, find the square root of 260,100.

Answer:

510

Explanation:

If 51^{2} = 2601 then the square root of 260100 will be 510.

Question 18.

Given that \(\sqrt{676}\) = 26, evaluate \(\sqrt{2,704}\).

Answer:

52

Explanation:

Recalling the multiplication facts of 400, you know that

2704 = 52 x 52

= 52²

So, \(\sqrt{2704}\) = 52

Question 19.

Given that \(\sqrt{1,521}\) = 39, evaluate 390^{2}.

Answer:

152100

Explanation:

If \(\sqrt{1,521}\) = 39 then 390² = 152100.

Question 20.

Heather wants to make a giant square quilt with sides of length 28 feet. She uses square patches of fabric that have sides of length 4 feet. How many patches of fabric will Heather need to make the giant square quilt?

Answer:

7 patches of fabric Heather will need to make the giant square quilt.

Explanation:

Heather wants to make a giant square quilt with sides of length 28 feet.

She uses square patches of fabric that have sides of length 4 feet.

4 x 7 = 28

So, 7 patches of fabric Heather will need to make the giant square quilt.

Question 21.

This week, customers at a carpet store pay $3 for a square foot of carpet. Next week the store will be having a sale. During the sale, each square foot of carpet will cost only $2. Neil wants to carpet two square rooms in his house. The floor in one room is 10 feet by 10 feet. The floor in the other room is 14 feet by 14 feet. How much money will Neil save if he waits to buy carpet during the sale?

Answer:

296

Explanation:

Neil wants to carpet two square rooms in his house.

The floor in one room is 10 feet by 10 feet.

10 x 10 = 100 square feet

The floor in the other room is 14 feet by 14 feet

14 x 14 = 196

Neil wants to carpet two square rooms in his house

100+196=296

During the sale, each square foot of carpet is reduced by 1 so, $296 Neil will save.