The collection of integers numbers, contain all the whole numbers., 1.25555....., is a rational number between 1.2 and 1.3., When the denominator of an expression contains a term with a square root , the process of converting it to an equivalent expression whose denominator is a rational number, is called rationalising the denominator., A number s is called a irrational number, if it cannot be written in the form p/q , where p and q are integers and q # 0., Every point on the number line, represents a unique real number., One number between 3/5 and 4/5 is , 11/15, A number r is called a rational number,, if it can be written in the form of p/q , where p and q are integers and q # 0., Example of irrational number, 1.101001000100001..., One number between ⅓ and ¾ is, 7/11, Example of rational number, 7.478478....

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