Keystones — Capstone
Five GCSE retrieval questions · 9 February 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - x - 11
Answer: (x - 1⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 22cm, angle = 47°. Give your answer to 2 decimal places
Answer: 209.17cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 45:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 14, 79, 75, 52, 77, 16, 44. Give your answer to 2 decimal places
Answer: Mean = 46.38, Median = 48, Range = 65