Keystones — Capstone
Five GCSE retrieval questions · 15 April 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 75°
Answer: 231.8cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:4. Find a:b:c.
Answer: 4:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 93, 92, 47, 39, 86, 69
Answer: Mean = 68.4, Median = 69, Range = 54