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Rationalizing The Denominator In Rational Expressions Calculator . Detailed step by step solutions to your rationalisation problems online with our math solver and calculator. A radical expression looks like this: Rationalise the Denominator (examples, videos, worksheets, solutions from www.onlinemathlearning.com To rationalize the denominator of the fraction, we multiply the numerator and denominator by $\sqrt{2}$ $\frac{5}{\sqrt{2}}\frac{\sqrt{2}}{\sqrt{2}}$ 3. This process makes the denominator free from radicals like square root and thus, makes the calculations easier. This is a fraction calculator with steps shown in the solution solution 49 b) 81 express the exponent as a product: