Keystones — Capstone
Five GCSE retrieval questions · 13 March 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 + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 29cm, angle = 59°
Answer: 335.6cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 2:5. Find a:b:c.
Answer: 4:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 80, 35, 53, 85, 73, 80, 88, 60
Answer: Mean = 69.4, Median = 73, Range = 53