Keystones — Capstone
Five GCSE retrieval questions · 31 March 2022 · 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 = 12cm, b = 17cm, angle = 57°
Answer: 85.5cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:3. Find a:b:c.
Answer: 16:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 35, 15, 17, 32, 80, 24, 52
Answer: Mean = 38.3, Median = 35, Range = 65