Keystones — Capstone
Five GCSE retrieval questions · 27 January 2020 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 20cm, angle = 52°
Answer: 204.9cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 12:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 26, 12, 57, 60, 11, 18, 59, 75
Answer: Mean = 45.9, Median = 57, Range = 84