# An Easy, Yet Impressive Mental Math Trick You Don’t Know Yet (vol.2)

What if I asked you to convert the repeating decimal 0.636363… into a fraction? How fast can you do it? Can you do it at all? Give me a few minutes of your time and you will learn how to calculate this in a few seconds.

Let’s take a look at the method using the following example:

**Step 1**: Find the repeating unit. Our repeating unit is 63.

**Step 2**: How many digits are in the repeating unit? Our unit is 63 which has two digits. Easy, right?