Keystones — Capstone
Five GCSE retrieval questions · 18 October 2019 · 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 + 2.4x
Answer: (x + 1.2)² - 1.44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 42°
Answer: 171.6cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 1:2. Find a:b:c.
Answer: 2:4:8 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 35, 70, 94, 43, 86, 39, 23
Answer: Mean = 53, Median = 43, Range = 71