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Squares and Square Roots

Calculator Skills For TI30XIIS

What is a Squared Number?

A squared number is any number multiplied by itself.

Example 2 x 2 = 4. Therefore 2 squared = 4

That is all there is to it. Take any number and multiply it by itself.

3 squared =

9

What is a Squared Number?

4 squared =

16

5 squared =

25

6 squared =

36. That’s all there is to it.

How Do We Do This On the Calculator?

1st Enter the number.

Push the X2 button.

Hit =

Try it. Enter the number 2.5

Push X2 and =. What did you get?

6.25. GREAT

What About Square Roots?

Finding a square root is the inverse of squaring a number. In other words, what two of the same number equal the result?

What About Square Roots?

Let’s try some.

What is the √9

3

What is √49

7

Got it?

How Do We Do This On the Calculator?

What is the 2nd function button and what does it do?

The 2nd function button is like a shift key and your computer. It enables the function directly ABOVE the button.

Find Square Root on Your Calculator

Push 2nd Function and look for 2nd on

the ScreenPush X2 Button With

√ Above It

Find Square Root on Your Calculator

Enter A Number Push =

Find Square Root on Your Calculator

Practice

√144 = 12

√169 =

13

√256

16

√49 =

7

√100

10

√57

7.55

More Practice

15^2

225

√25

5

30^2

900

√15

3.87

17^2

289

√73

8.54

How Do You Feel?

Homework is to practice the squares and square roots sheet.

Look at the first one. What is 2^2

4. Check with your calculator.

It is 4. GOOD

What is √2.

1.414

Further Help

https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-numbers-operations/cc-8th-roots/v/understanding-square-roots

This powerpoint and link are on my weebly site.