# Is 7.5 a rational, irrational, natural, whole, integer or real number?

##### 1 Answer

#### Explanation:

Any number that can be written as a fraction, or in other words the ratio between two numbers, is a rational number.

It is also a real number as rational numbers are a sub-set of the collection of real numbers.

**Extra:**

Let's do all the definitions:

**Natural** : counting numbers: 1, 2, 3, 4, 5...

**Whole** and **integer** : as before, but including the zero and negative numbers: ..... -3, -2, -1, 0, 1, 2, 3,...

**Rational** : all numbers that can be written as a ratio = a fraction

... -3/1 -2/3 -257/347 0 14/3 22/7....

**Irratonal** : all numbers that can not be written as a ratio: the square root of 2, pi, e, ....

**Real numbers** : all of the above put together. You can use real numbers to measure real things, like length or temperature.

There is a set of numbers outside this realm, and they're called **imaginary** and **complex** numbers, and they all are connected to the square root of -1.