Keystones — Capstone
Five GCSE retrieval questions · 16 January 2023 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 20cm, angle = 66°
Answer: 146.2cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:5. Find a:b:c.
Answer: 4:3:5 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 93, 17, 34, 19, 30, 93, 14
Answer: Mean = 43.1, Median = 34, Range = 79