Keystones — Capstone
Five GCSE retrieval questions · 9 September 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2.2x
Answer: (x + 1.1)² - 1.21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 52°
Answer: 128.cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:5. Find a:b:c.
Answer: 6:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 97, 52, 67, 95, 25, 41, 57
Answer: Mean = 59.5, Median = 57, Range = 72