1. Squares and square roots
Objective:
Find squares of numbers and square roots of perfect squares.

2. A square has all sides the same length.
So to find the area of a square, you
need to multiply the length × width.
The Area of the square at the
right is 5 × 5 which equals
25 square units.
The square of a number is the product of a number and itself.
So, the square of 5 is 25.
We can also say five squared or write it:
52= 5 × 5= 25
Examples: 1) Find the square of 3.
2) Find the square of 12.

3. Perfect squares:
Numbers like 9, 16, and 25 are called square numbers or perfect squares because they are squares of whole numbers.
For Example: 9 = 3 ● 3
16 = 4 ● 4
25 = 5 ● 5

4. Square roots:
The factors multiplied to form a perfect square are called square roots.
A radical sign √ is the symbol used to indicate a square root of a number.
A square root of a number is one of its two equal factors.
For example: 4 ● 4 = 16, so the √16 = 4
Examples: Find √81 =
9 ( because 9 × 9 = 81)
Find √225 =

5. To do this activity you will have to write a sub-title: SQUARE ROOTS
Complete the activity by finding the square roots of 4, 9, 16, 25, 36, 49, 64, 81, 100.
To do this activity you will have to write a sub-title: SQUARE ROOTS
Draw the square rood sign (radical sign) in a different color.
Color the necessary squares to make the square root correct.
3. Then write the square
root and the answer in
another color.

6. Homework: 4 1 7 11 16 20 18 34 Find the square of each number. 9. √4
Find each square root.
9. √4
10. √16
11. √49
12. √100
13. √144
14. √256
15. √529
16. √625