How To Get The Square Root Of A Number

Squares and Square Roots

First learn about Squares, then Square Roots are easy.

How to Square A Number

To square a number: multiply it by itself.

Example: What is 3 squared?

3 Squared

= 3 × 3 = 9

"Squared" is often written as a little 2 like this:

4 squared is 16
This says "4 Squared equals 16"
(the little 2 says the number appears twice in multiplying)

Squares From 0² to 6²

0 Squared	=	0²	=	0 × 0	=	0
1 Squared	=	1²	=	1 × 1	=	1
2 Squared	=	2²	=	2 × 2	=	4
3 Squared	=	3²	=	3 × 3	=	9
4 Squared	=	4²	=	4 × 4	=	16
5 Squared	=	5²	=	5 × 5	=	25
6 Squared	=	6²	=	6 × 6	=	36

Negative Numbers

We can also square negative numbers.

That was interesting!

When we square a negative number we get a positive result.

Just the same as squaring a positive number:

5x5 = -5x-5

(For more detail read Squares and Square Roots in Algebra)

Square Roots

A square root goes the other way:

square root of 9 is 3

3 squared is 9, so a square root of 9 is 3

A square root of a number is ...

... a value that can be multiplied by itself to give the original number.

A square root of 9 is ...

... 3, because when 3 is multiplied by itself we get 9.

It is like asking:

What can we multiply by itself to get this?

To help you remember think of the root of a tree:

"I know the tree , but what root made it?"

In this case the tree is "9", and the root is "3".

Here are some more squares and square roots:


4		16
5		25
6		36
7		49

Decimal Numbers

It also works for decimal numbers.

Try the sliders below (note: '...' means the decimals continue on forever):

Using the sliders:

What is the square root of 8?
What is the square root of 9?
What is the square root of 10?
What is 1 squared?
What is 1.1 squared?
What is 2.6 squared?

Negatives

We discovered earlier that we can square negative numbers:

Example: (−3) squared

(−3) × (−3) = 9

And of course 3 × 3 = 9 also.

So the square root of 9 could be −3 or +3

Example: What are the square roots of 25?

(−5) × (−5) = 25

5 × 5 = 25

So the square roots of 25 are −5 and +5

The Square Root Symbol

This is the special symbol that means "square root", it is sort of like a tick,
and actually started hundreds of years ago as a dot with a flick upwards.

It is called the radical , and always makes mathematics look important!

We use it like this:

and we say "square root of 9 equals 3"

Example: What is √25?

25 = 5 × 5, in other words when we multiply 5 by itself (5 × 5) we get 25

So the answer is:

√25 = 5

But wait a minute! Can't the square root also be −5? Because (−5) × (−5) = 25 too.

Well the square root of 25 could be −5 or +5.
But when we use the radical symbol √ we only give the positive (or zero) result.

Example: What is √36 ?

Answer: 6 × 6 = 36, so √36 = 6

Perfect Squares

The Perfect Squares (also called "Square Numbers") are the squares of the integers:

	Perfect Squares
0	0
1	1
2	4
3	9
4	16
5	25
6	36
7	49
8	64
9	81
10	100
11	121
12	144
13	169
14	196
15	225
	etc...

Try to remember them up to 12.

Calculating Square Roots

It is easy to work out the square root of a perfect square, but it is really hard to work out other square roots.

Example: what is √10?

Well, 3 × 3 = 9 and 4 × 4 = 16, so we can guess the answer is between 3 and 4.

Let's try 3.5: 3.5 × 3.5 = 12.25
Let's try 3.2: 3.2 × 3.2 = 10.24
Let's try 3.1: 3.1 × 3.1 = 9.61
...

Getting closer to 10, but it will take a long time to get a good answer!

At this point, I get out my calculator and it says:

3.1622776601683793319988935444327

But the digits just go on and on, without any pattern.

So even the calculator's answer is only an approximation !

Note: numbers like that are called Irrational Numbers, if you want to know more.

The Easiest Way to Calculate a Square Root

Use your calculator's square root button!

And also use your common sense to make sure you have the right answer.

A Fun Way to Calculate a Square Root

There is a fun method for calculating a square root that gets more and more accurate each time around:

	a) start with a guess (let's guess 4 is the square root of 10)
	b) divide by the guess (10/4 = 2.5) c) add that to the guess (4 + 2.5 = 6.5) d) then divide that result by 2, in other words halve it. (6.5/2 = 3.25) e) now, set that as the new guess , and start at b) again

Our first attempt got us from 4 to 3.25
Going again (b to e) gets us: 3.163
Going again (b to e) gets us: 3.1623

And so, after 3 times around the answer is 3.1623, which is pretty good, because:

3.1623 x 3.1623 = 10.00014

Now ... why don't you try calculating the square root of 2 this way?

How to Guess

What if we have to guess the square root for a difficult number such as "82,163" ... ?

In that case we could think "82,163" has 5 digits, so the square root might have 3 digits (100x100=10,000), and the square root of 8 (the first digit) is about 3 (3x3=9), so 300 is a good start.

Square Root Day

The 4th of April 2016 is a Square Root Day, because the date looks like 4/4/16

The next after that is the 5th of May 2025 (5/5/25)

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