Keystones — Capstone
Five GCSE retrieval questions · 29 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√99
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² - x - 9
Answer: (x - 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 23cm, angle = 65°. Give your answer to 2 decimal places
Answer: 177.18cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 15:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 63, 23, 14, 39, 42, 53, 68
Answer: Mean = 41, Median = 40.5, Range = 54