Keystones — Capstone
Five GCSE retrieval questions · 25 May 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² + 5.2x
Answer: (x + 2.6)² - 6.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 51°
Answer: 112.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 2:5. Find a:b:c.
Answer: 3:2:5 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 75, 49, 49, 55, 75, 55
Answer: Mean = 58.3, Median = 55, Range = 26