Keystones — Capstone
Five GCSE retrieval questions · 21 March 2019 · 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 = 27cm, b = 30cm, angle = 79°
Answer: 397.6cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:5. Find a:b:c.
Answer: 2:4:10 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 27, 41, 92, 53, 29, 26, 40, 43
Answer: Mean = 43.7, Median = 41, Range = 66