How do you rationalise surds?

Irrational surds occur when a fraction's denominator is a surd, leaving the fraction in a messy way. To rationalise surds, the general rule is that you multiply the both the denominator and the numerator of the fraction by the value of the denominator. This will square the surd, making the denominator a whole number and therefore rationalise the fraction.

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Answered by Baraka M. Maths tutor

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