Amongst the 4 types of numbers,

**NATURAL NUMBERS**is the smallest of all - starts from 1, followed by 2, 3, 4, 5, ... basically, it's**positive integers****INTEGERS**is made up by**negative integers**(-1, -2, -3, .... )**, zero**(0)**and positive integers**(1, 2, 3, ...)**RATIONAL NUMBERS**are numbers that can be expressed as a fraction a/b such that both a and b are integers and b is non-zero. Integers and natural numbers are rational numbers since we can express them with denominator = 1.**REAL NUMBERS**are numbers include natural numbers, integers and rational numbers. It also includes numbers that cannot be expressed as a fraction, e.g.*pi*, square root of 2

Use the following exercise to check your understanding:

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