GCSE Maths (AQA)

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Advanced Rationalising the Denominator

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Number Structure and Calculation

Advanced Rationalising the Denominator

4:52 Surd Problems
Spec N8 A4
Previous Rationalising the Denominator Next Ordering Numbers in Standard Form
  • Rationalizing a denominator with addition or subtraction involves changing the sign when multiplying.
  • To rationalize the denominator, multiply by the conjugate of the denominator.
  • Use FOIL to expand and simplify the numerator and denominator.
  • The terms in the denominator will cancel out when the sign is changed.
  • The final answer is obtained by simplifying the fraction.

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