Keystones — Capstone
Five GCSE retrieval questions · 29 December 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 13cm, angle = 68°
Answer: 102.5cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 2:5. Find a:b:c.
Answer: 4:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 54, 33, 53, 17, 42, 99
Answer: Mean = 46.1, Median = 42, Range = 82