Keystones — Capstone
Five GCSE retrieval questions · 13 February 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 + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 19cm, angle = 79°
Answer: 214.5cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:3. Find a:b:c.
Answer: 4:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 99, 78, 72, 15, 50, 41, 43, 55
Answer: Mean = 61.4, Median = 55, Range = 85