Keystones — Capstone
Five GCSE retrieval questions · 15 November 2024 · 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 + 5.4x
Answer: (x + 2.7)² - 7.29 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 76°
Answer: 163cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:5. Find a:b:c.
Answer: 16:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 21, 43, 78, 20, 21, 87, 77, 46
Answer: Mean = 47.7, Median = 43, Range = 67