Keystones — Capstone
Five GCSE retrieval questions · 26 December 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√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 = 26cm, b = 15cm, angle = 67°
Answer: 179.5cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:5. Find a:b:c.
Answer: 6:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 17, 77, 31, 46, 12, 52
Answer: Mean = 36.7, Median = 31, Range = 65