If we want a definition, we can start by saying that fractional numbers are numbers that represent one or more parts of a unit that has been divided in equal parts.

The fractional numbers are figured out by two whole numbers (**the fraction terms**) that are separated by a horizontal line (**the fraction line**). The number above the line (**the numerator**) can be every whole number and the number below the line (**the denominator**) should be different from zero. Here are some examples of some kinds of fractions:

- Proper Fraction: the number is inferior to the denominator, for instance `3/4` ;
- Improper fraction: the numerator is superior to the denominator, for instance `9/2` ;
- Mixed Fraction or Mixed Numeral: it is composed of a whole part and a fractional one, for instance `2 1/3` ;
- Equivalent Fractions: fractions that keep on the same proportion of another fraction, for instance: `5/2 = 10/4` ;
- Irreducible Fraction: it cannot be simplified, for instance: `4/3` ;
- Decimal Fraction: the denominator is a power whose base is 10 (10,100,1000,...), for instance `8/100` ;

It may seem weird, but the answer is **No**. First of all because the definition tells us that fractional numbers are numbers that represent one or more parts of the whole. So, for instance, the number `10/2`, which is written as a fraction is not a fractional number, since it figures out number `5` and this one is not part of a whole. The number `sqrt 2 / 3` is also written as a fraction, but it is not a fractional number since the numerator is not a whole number.

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