Keystones — Capstone
Five GCSE retrieval questions · 16 August 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² + 2x
Answer: (x + 1)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 64°
Answer: 134.4cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 3:4. Find a:b:c.
Answer: 4:3:4 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 99, 68, 73, 58, 37, 60, 22, 25
Answer: Mean = 52.1, Median = 58, Range = 77