Author -  Sai gowtham

# How to round a float value to N decimal places in Ruby

In this tutorial, we are going to learn about How to round a float value to N decimal places in Ruby using the `round()` method.

Consider, we have a float value like this.

``num  = 12.1421``

Now, we need to format the above float value to 3 decimal places like this `12.142`.

## Using the round() method

To round a number to N decimal places in Ruby, we can use the `round()` method by passing `N` as a argument to it.

N is number of decimal places we need to round the float value.

The `round()` method takes the number of digits as argument and formats the number into the mentioned decimal places. By default the `round()` method removes the fractional part.

Let’s see an example:

``````num  = 12.1421

puts num.round(2)``````

Output:

``12.142``

In the example, above we have passed `3` as an argument to the round() method. So that it rounds a float value to 3 decimal places.

Similarly, if you want round a float value to 2 decimal places just pass the 2 as an argument to the round() method.

Here is an example of how to round a float value to 2 decimal places:

``````num  = 12.1421

puts num.round(2)``````

Output:

``12.14``

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