Keystones — Capstone
Five GCSE retrieval questions · 26 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² - 11x - 8
Answer: (x - 11⁄2)² - 153⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 74°. Give your answer to 2 decimal places
Answer: 129.77cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 62, 61, 84, 33, 26, 64, 71
Answer: Mean = 55.5, Median = 61.5, Range = 58