Keystones — Capstone
Five GCSE retrieval questions · 27 December 2022 · 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 + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 60°
Answer: 151.6cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 3:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 100, 90, 85, 47, 69, 22, 72
Answer: Mean = 65, Median = 72, Range = 78