# What are the differences between JavaScript's Math.floor() and Math.ceil() functions?Benjamin C

The`Math.floor()`

and`Math.ceil()`

functions in JavaScript are used to round numbers down and up, respectively. Here are the differences between these two functions:
**1. Rounding Down (Math.floor()):**
- The`Math.floor()`

function rounds a number down to the nearest integer that is less than or equal to the given value.
- It returns the largest integer less than or equal to the given value.
- For positive numbers, it simply removes the decimal part.
- For negative numbers, it rounds towards negative infinity.
- Example:`Math.floor(4.9)`

returns`4`

,`Math.floor(-2.1)`

returns`-3`

.
**2. Rounding Up (Math.ceil()):**
- The`Math.ceil()`

function rounds a number up to the nearest integer that is greater than or equal to the given value.
- It returns the smallest integer greater than or equal to the given value.
- For positive numbers, it rounds towards positive infinity.
- For negative numbers, it simply removes the decimal part.
- Example:`Math.ceil(4.1)`

returns`5`

,`Math.ceil(-2.9)`

returns`-2`

.
In summary, the main difference between`Math.floor()`

and`Math.ceil()`

lies in the direction of rounding.`Math.floor()`

always rounds down, while`Math.ceil()`

always rounds up.

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