Keystones — Capstone
Five GCSE retrieval questions · 18 May 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 30cm, angle = 48°
Answer: 312.cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 1:3. Find a:b:c.
Answer: 3:4:12 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 92, 67, 63, 59, 80, 17, 79
Answer: Mean = 58.9, Median = 67, Range = 78