Keystones — Capstone
Five GCSE retrieval questions · 18 December 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 + 4.2x
Answer: (x + 2.1)² - 4.41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 72°
Answer: 111.3cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 1:2. Find a:b:c.
Answer: 3:2:4 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 67, 51, 52, 18, 65, 61, 17, 98
Answer: Mean = 57.9, Median = 61, Range = 81