Keystones — Capstone
Five GCSE retrieval questions · 10 November 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 23cm, angle = 69°
Answer: 182.5cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:3. Find a:b:c.
Answer: 2:4:3 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 87, 78, 17, 96, 33, 71, 60
Answer: Mean = 57.9, Median = 71, Range = 79