Surds - Millburn Academy

Surds - Millburn Academy

Millburn Academy Maths departmen National 5 Surds 3 Rationalise the Denominator The denominator of a fraction is irrational when it contains a surd. e .g . 1 2 It is often easier to work with fractions with a rational denominator. To do this we must remember that 2 =

E Rationalise the denominator of the fraction . 2 5 2 5 5 5 5 When we multiply the numerator and the denominator of a fraction by the same number we make an equivalent fraction of the same value. E Rationalise the denominator of the fraction . 8 6 86 6 6 6

4 6 3 Simplify E Rationalise the denominator of the fraction . 1 3 3 2 3 3 2 3 3 6 We do not need to multiply by the whole denominator, just the surd.

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