Keystones — Capstone
Five GCSE retrieval questions · 16 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√32
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 3x - 3
Answer: (x - 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 45°. Give your answer to 2 decimal places
Answer: 212.13cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 13, 25, 23, 80, 16, 73, 46
Answer: Mean = 43.75, Median = 35.5, Range = 67