Keystones — Capstone
Five GCSE retrieval questions · 25 November 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 12cm, angle = 72°
Answer: 142.7cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:4. Find a:b:c.
Answer: 9:6:8 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 47, 29, 31, 69, 16, 21, 94, 11
Answer: Mean = 41.8, Median = 31, Range = 83