Keystones — Capstone
Five GCSE retrieval questions · 9 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√63
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 5
Answer: (x - 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 80°. Give your answer to 2 decimal places
Answer: 257.03cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:20:32 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 19, 52, 72, 26, 59, 99, 76, 13. Give your answer to 2 decimal places
Answer: Mean = 55.67, Median = 59, Range = 86