Keystones — Capstone
Five GCSE retrieval questions · 3 January 2023 · 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 + 3.8x
Answer: (x + 1.9)² - 3.61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 20cm, angle = 67°
Answer: 193.3cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 1:2. Find a:b:c.
Answer: 8:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 28, 24, 16, 54, 67, 22, 62
Answer: Mean = 43, Median = 54, Range = 55