Keystones — Capstone
Five GCSE retrieval questions · 14 August 2022 · 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 21cm, angle = 63°
Answer: 168.4cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:3. Find a:b:c.
Answer: 8:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 80, 36, 23, 83, 45, 62, 94, 76
Answer: Mean = 63.9, Median = 76, Range = 71