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# Rounding

If you want to round a number, you can use the

`Math.round()`

, `Math.floor()`

and `Math.ceil()`

functions.
```
var a = Math.round(5.49);
var b = Math.round(4.5);
var c = Math.floor(5.99);
var d = Math.ceil(4.01);
```

`Math.round()`

rounds a number to the nearest integer,
`Math.floor()`

rounds a number downwards to the nearest integer and
`Math.ceil()`

rounds a number upwards to the nearest integer.
Therefore, the variables `a`

to `d`

all get the value `5`

.## Exercise

Write a function

`round100`

that rounds a number to the nearest hundred.
`round100(1749)`

should return `1700`

and `round100(856.12)`

should return `900`

.