Keystones — Capstone
Five GCSE retrieval questions · 11 January 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 + 5x
Answer: (x + 2.5)² - 6.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 26cm, angle = 43°
Answer: 212.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:3. Find a:b:c.
Answer: 3:2:6 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 83, 80, 88, 57, 31, 26
Answer: Mean = 55.1, Median = 57, Range = 67