Keystones — Capstone
Five GCSE retrieval questions · 7 March 2022 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
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 = 24cm, b = 30cm, angle = 73°
Answer: 344.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:3. Find a:b:c.
Answer: 8:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 87, 33, 45, 92, 20, 53, 81, 48
Answer: Mean = 61.2, Median = 53, Range = 72