Keystones — Capstone
Five GCSE retrieval questions · 15 July 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 3x
Answer: (x + 1.5)² - 2.25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 29cm, angle = 70°
Answer: 354.3cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 1:2. Find a:b:c.
Answer: 4:6:12 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 19, 81, 75, 12, 89, 59, 33, 95
Answer: Mean = 62.6, Median = 75, Range = 88