High Quality Content by WIKIPEDIA articles! In elementary algebra root rationalisation is a process by which surds in the denominator of a fraction are eliminated.These surds may be monomials or binomials involving square roots, in simple examples. There are wide extensions to the technique.For the fundamental technique, the numerator and denominator must be multiplied, but by the same factor.Example 1: frac{10}{sqrt{a}} To rationalize this kind of monomial, bring in the factor sqrt{a}: frac{10}{sqrt{a}} = frac{10}{sqrt{a}} cdot frac{sqrt{a}}{sqrt{a}} = frac{{10sqrt{a}}}{sqrt{a}^2}

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