# Real Numbers - Overview

Real Numbers

﻿A Real Number is any positive or negative number which includes integers, rational and irrational numbers. In simple terms, all the numbers except complex number(numbers which have negative roots/numbers in the form "a + ib") can be called as Real Numbers.

﻿Integers
﻿The set of all negative and positive numbers including zero but not decimal numbers(like 7.2, 85.5, 3/2.....) are called Integers.
Set of Natural Numbers={-∞,.....-3, -2, -1, 0, 1, 2, 3, ….., ∞}

Natural Numbers
﻿The non-negative integers except 0 is called Natural Numbers. It is also called 'Counting Numbers'.
﻿Set of Natural Numbers={1, 2, 3, 4, 5, 6, …..∞}

﻿Rational Numbers
﻿A number in the form of p/q where p and q are integers and q0 that can also be expressed in terms of terminating or repeating decimals.
﻿Examples: 4, -8, 4.27, 33.3333333,...etc.

﻿Irrational Numbers
﻿A number which can be expressed in the form of p/q where p and q are integers and q0 that are non-terminating and non-repeating decimals.
﻿Examples: π, e, √3, ∛13...etc.