Keystones — Capstone
Five GCSE retrieval questions · 15 March 2021 · 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 + 3.6x
Answer: (x + 1.8)² - 3.24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 67°
Answer: 198.8cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:3. Find a:b:c.
Answer: 3:2:3 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 58, 96, 73, 36, 75, 90, 62, 25
Answer: Mean = 65.7, Median = 73, Range = 71