# How much is two square

## Square Numbers - How To Calculate Them?

### Square numbers

As **Square numbers** one denotes all numbers that have the **Product of a natural number with itself** are. Natural numbers are all whole numbers greater than $ 0 $, i.e. $ 1,2,3, ... $ and so on. The term comes from the fact that when we multiply two numbers, we can imagine a rectangle with the first number as the width and the second as the height. If the first and the second number are the same - let's multiply a number by itself - the result is a rectangle whose height is equal to its width. Such a rectangle is a **square**.

Let's look at the natural number $ 7 $ as an example. If we multiply this by itself, we get:

$ 7 \ cdot 7 = 49 $

That means $ 49 $ is a square number. They say, "$ 49 $ is the square of $ 7 $."

So that we don't always have to write out multiplying a number by itself, we use the **Power notation**. This allows us to write $ 7 \ cdot 7 $ as $ 7 ^ 2 $. You then say: “$ 7 $ **to square** is $ 49 $. "

If possible, memorize the squares of the numbers from $ 1 to $ 20:

$ \ begin {array} {c | c || c | c} number & square number & number & square number \ \ hline 1 & 1 & 11 & 121 \ 2 & 4 & 12 & 144 \ 3 & 9 & 13 & 169 \ 4 & 16 & 14 & 196 \ 5 & 25 & 15 & 225 \ 6 & 36 & 16 & 256 \ 7 & 49 & 17 & 289 \ 8 & 64 & 18 & 324 \ 9 & 81 & 19 & 361 \ 10 & 100 & 20 & 400 \ end {array} $

For example, recognizing square numbers can help you identify the **binomial formulas** or when calculating faster **root** help.

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