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# Numbers

Numbers are represented by simple numerals. They can have a decimal point and a minus sign.

```
let x1 = 1;
let x2 = 1.0;
let x3 = 3.14;
let x4 = -1;
```

`1`

and `1.0`

are the same number.
You can calculate with numbers. The four basic arithmetics adding, subtracting, multiplying and dividing are represented by
` + - * `

and `/`

.
```
let x1 = 6;
let x2 = 2;
let x3 = x1 + x2;
let x4 = x1 - x2;
let x5 = x1 * x2;
let x6 = x1 / x2;
```

The variables `x3`

to `x6`

thus have the values `8`

, `4`

, `12`

and `3`

.## Exercise

Write a function

Example:

`add`

that takes two numbers and returns their sum.Example:

`add(1, 2)`

should return `3`

.
+ Hint

```
function add(x, y) {
return ...
}
```

+ Solution

```
function add(x, y) {
return x + y;
}
```