Keystones — Capstone
Five GCSE retrieval questions · 1 January 2023 · 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 + 3.4x
Answer: (x + 1.7)² - 2.89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 28cm, angle = 64°
Answer: 364.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 90, 20, 10, 83, 81, 27, 88
Answer: Mean = 51.1, Median = 81, Range = 80