Keystones — Capstone
Five GCSE retrieval questions · 31 July 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² - 5x + 12
Answer: (x - 5⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 18cm, angle = 60°. Give your answer to 2 decimal places
Answer: 226.03cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:14:2 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 79, 44, 59, 36, 62, 62, 22, 12. Give your answer to 2 decimal places
Answer: Mean = 52.22, Median = 59, Range = 82