Keystones — Capstone
Five GCSE retrieval questions · 8 November 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 6x
Answer: (x + 3)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 60°
Answer: 107cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 35, 47, 35, 84, 61, 43, 21
Answer: Mean = 49.1, Median = 47, Range = 63