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Start your free trial###### wilton cruz

5,917 Points# Random Numbers in JavaScript Math.random() at the Mozilla Developer Network

why random to six,why not to seven and Up?

or is it because he multiplied by 6?

help with this please!,and thanks in advance.

## 1 Answer

###### bothxp

16,510 PointsHi wilton,

Math.random() returns a floating point number from 0 up to but not including 1. For example:

```
> Math.random()
0.2625259844878184
> Math.random()
0.06513541210374607
> Math.random()
0.5629554153276711
```

So that is great if you want a decimal number between 0 and 1, but normally you will want a larger number. To do this you can multiply Math.random() by a number. If we wanted numbers between 0 & up to but not including 100:

```
> Math.random() * 100
26.25259844878184
> Math.random() * 100
6.513541210374607
> Math.random() * 100
56.29554153276711
```

Often you will want a whole number, for that we can use Math.floor() which will strip off the numbers after the decimal:

```
> Math.floor( Math.random() * 100 )
26
> Math.floor( Math.random() * 100 )
6
> Math.floor( Math.random() * 100 )
56
```

Math.floor( Math.random() * 100 ) will return the numbers 0,1,2,3,4,5 ...... 97,98,99.

If you wanted numbers between 1 & 100 then you would need to + 1. So it becomes

```
Math.floor( Math.random() * 100 ) + 1
```

In the video Dave just used 6 as an example, but you can use what ever number you wanted.

## Kelvin Simon

6,209 Points## Kelvin Simon

6,209 PointsIf you want a number higher than 6 the yes you can just replace 6 with a different number. For example

`Math.floor((Math.random() * 10) + 1);`

this would produce a number between 1 & 10