Keystones — Capstone
Five GCSE retrieval questions · 17 November 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 66°
Answer: 109.6cm² -
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: 50, 28, 47, 50, 58, 20, 99, 97
Answer: Mean = 56.1, Median = 50, Range = 79