Component of a real number expressed in decimal notation and located to the right of the decimal point.

### Example

Consider the real number 907.56.

- The whole part of this number is 907.
- Its decimal part is 0.56.

Consider the real number \(\sqrt{5}\).

- The whole part of this real number is 2.
- Its decimal part is 0.236 067 …
- In the case of an irrational number, we cannot talk about a fractional part.