Keystones — Capstone
Five GCSE retrieval questions · 28 June 2021 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: x² + 5.6x
Answer: (x + 2.8)² - 7.84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 23cm, angle = 51°
Answer: 151.9cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 4:5. Find a:b:c.
Answer: 2:4:5 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 89, 45, 14, 91, 47, 28, 37
Answer: Mean = 49.6, Median = 46, Range = 77