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# Real Numbers Definition

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 Sub Topics Let us consider a number like $\frac{\sqrt{-5}}{2}$ , $\sqrt{-7}$. These kind of numbers can be expressed in terms of i like $\sqrt{7}$ i, 2.5 i etc. where i represents the imaginary numbers. To differentiate the imaginary numbers from the numbers existing in real there came a concept of Real Numbers. Real numbers are defined as those numbers which do not have i (imaginary numbers) as a part of it. It is a Set of both Rational and Irrational Numbers. It is represented by R. Example: R = {-3, -2, -1, 0, 0.5, 2, 5......}. In short it represents particular or fixed amount of quantity. It includes positive or negative numbers, natural number, whole numbers, fractional numbers, integers etc.