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Squares and Square Roots It is hip to be square.

2 x 2 4

2

2

2

The square root of 4 is

3 x 3 9

3

3

3

The square root of 9 is

4 x 4 16

4

4

4

The square root of 16 is

5 x 5 25

5

The square root of 25 is

Square Number

- Also called a perfect square
- A number that is the square of a whole number
- Can be represented by arranging objects in a

square.

Square Numbers

Square Numbers

- 1 x 1 1
- 2 x 2 4
- 3 x 3 9
- 4 x 4 16

Square Numbers

- 1 x 1 1
- 2 x 2 4
- 3 x 3 9
- 4 x 4 16
- 5 x 5 25
- 6 x 6 36
- 7 x 7 49
- 8 x 8 64

- 9 x 9 81
- 10 x 10 100
- 11 x 11 121
- 12 x 12 144
- 13 x 13 169
- 14 x 14 196
- 15 x 15 225

ActivityIdentify the following numbers as

perfect squares or not.

- 16
- 15
- 146
- 300
- 324
- 729

Square Numbers

- The large square has an area of 4cm x 4cm 16

cm2. - The number 4 is called the square root of 16.
- We write 4 16

4cm

4cm

16 cm2

Square Root

- A number which, when multiplied by itself,

results in another number. - Ex 5 is the square root of 25.

5 25

Finding Square Roots

- We can use the following strategy to find a

square root of a large number.

4 x 9 4 x 9

36 2 x 3

6 6

Finding Square Roots

4 x 9 4 9

36 2 x 3

6 6

- We can factor large perfect squares into smaller

perfect squares to simplify.

Finding Square Roots

- Activity Find the square root of 256

256

4 x

64

2 x 8

16

Estimating Square Roots

- 25 ?

Estimating Square Roots

- 25 5

Estimating Square Roots

- 49 ?

Estimating Square Roots

- 49 7

Estimating Square Roots

- 27 ?

Estimating Square Roots

- 27 ?

Since 27 is not a perfect square, we have to use

another method to calculate its square root.

Estimating Square Roots

- Not all numbers are perfect squares.
- Not every number has an Integer for a square

root. - We have to estimate square roots for numbers

between perfect squares.

Estimating Square Roots

- To calculate the square root of a non-perfect

square - 1. Place the values of the adjacent perfect

squares on a number line. - Interpolate between the points to estimate to the

nearest tenth.

Estimating Square Roots

- Example 27

What are the perfect squares on each side of 27?

25

35

30

36

Estimating Square Roots

- Example 27

half

5

6

25

35

30

36

27

Estimate 27 5.2

Estimating Square Roots

- Example 27

- Estimate 27 5.2
- Check (5.2) (5.2) 27.04

Review

- What are the perfect squares between 1-250?

1

4

16

9

25

36

49

64

81

100

121

144

169

196

225

Squares/Square Root Review

- What is a number squared?
- What is a square root?
- Are all numbers perfect squares?
- Do all numbers have square roots?
- When is the test on squared numbers 1-15?
- Study those flashcards!!!

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