Keystones — Capstone
Five GCSE retrieval questions · 9 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 + 4x
Answer: (x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 26cm, angle = 71°
Answer: 196.7cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 4:5. Find a:b:c.
Answer: 8:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 98, 48, 88, 46, 72, 96, 54
Answer: Mean = 70.4, Median = 72, Range = 52