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Surds (Year 11)

Free printable UK Year 11 (GCSE Higher tier) maths worksheet on surds: simplify roots, multiply surds, rationalise denominators and expand brackets with exact values.

βœ“ Answer key checked by math, never wrong
Grade 10 Β· Math worksheet
Name
Date
Math

Surds

Work exactly: simplify each surd by taking out the largest square factor, multiply surds with √a x √b = √(ab), rationalise denominators, and expand brackets keeping exact surd form throughout. Never replace a surd with a rounded decimal. Higher tier.

  1. 1.
    Simplify 8\sqrt{8} fully.
  2. 2.
    Simplify 20\sqrt{20} fully.
  3. 3.
    Simplify 80\sqrt{80} fully.
  4. 4.
    Simplify 40\sqrt{40} fully.
  5. 5.
    Work out 15\sqrt{15} x 5\sqrt{5}, giving your answer as a simplified surd.
  6. 6.
    Work out 5\sqrt{5} x 10\sqrt{10}, giving your answer as a simplified surd.
  7. 7.
    Work out 5\sqrt{5} x 5\sqrt{5}, giving your answer as a simplified surd or an integer.
  8. 8.
    Rationalise the denominator of 1/3\sqrt{3}.
  9. 9.
    Rationalise the denominator of 12/2\sqrt{2}.
  10. 10.
    Rationalise the denominator of 5/5\sqrt{5}.
  11. 11.
    Expand and simplify (1 + 3\sqrt{3})(2 + 33\sqrt{3}).
  12. 12.
    Expand and simplify (5 + 33\sqrt{3})(6 + 23\sqrt{3}).
  13. 13.
    Expand and simplify (5 + 33\sqrt{3})(5 - 33\sqrt{3}).
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