Keystones — Capstone
Five GCSE retrieval questions · 7 July 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 + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 55°
Answer: 118.4cm² -
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: 67, 27, 83, 86, 42, 23, 54, 10, 84
Answer: Mean = 52.9, Median = 54, Range = 76