Keystones — Capstone
Five GCSE retrieval questions · 18 October 2020 · 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 + 4.8x
Answer: (x + 2.4)² - 5.76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 40°
Answer: 75.2cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 2:3. Find a:b:c.
Answer: 2:4:6 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 70, 18, 45, 31, 16, 92, 42, 30
Answer: Mean = 44.2, Median = 42, Range = 76