Keystones — Capstone
Five GCSE retrieval questions · 6 January 2023 · 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 = 28cm, b = 17cm, angle = 40°
Answer: 153cm² -
4. Ratio Combining two ratios
a:b is 2:1 and b:c is 1:2. Find a:b:c.
Answer: 4:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 54, 40, 45, 57, 17, 89, 30
Answer: Mean = 46.6, Median = 45, Range = 72