Keystones — Capstone
Five GCSE retrieval questions · 26 June 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 24cm, angle = 76°
Answer: 267.8cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 3:5. Find a:b:c.
Answer: 12:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 75, 82, 85, 34, 75, 18, 22, 53
Answer: Mean = 53.1, Median = 53, Range = 67