Keystones — Capstone
Five GCSE retrieval questions · 17 November 2019 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 14cm, angle = 59°
Answer: 168cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:5. Find a:b:c.
Answer: 8:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 40, 93, 57, 87, 86, 96, 89
Answer: Mean = 75.9, Median = 87, Range = 56