# Inaccurate calculations in JavaScript

Fractions are stored in computers in such a way that they can often be inaccurately represented. In this case, some surprise can wait you when a routine operation produces a strange result. The example:

`let a = 0.1 + 0.2; alert(a); // shows 0.30000000000000004`

To prevent this behavior, you can use the special method `toFixed`, which rounds up to a given position in the fractional part. Let's round up our result:

`let a = 0.1 + 0.2; alert(a.toFixed(2)); // shows '0.30'`

The `toFixed` method returns the result as a string. You can convert its result to a number:

`let a = 0.1 + 0.2; alert(+a.toFixed(2)); // shows 0.3`

Check the result of the next operation:

`alert(0.1 * 0.2);`

Check the result of the next operation:

`alert(0.3 - 0.1);`
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