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.