Keystones — Capstone
Five GCSE retrieval questions · 8 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - 9x - 9
Answer: (x - 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 68°. Give your answer to 2 decimal places
Answer: 389.42cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 4:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 82, 31, 84, 99, 98, 66, 24, 19. Give your answer to 2 decimal places
Answer: Mean = 57.78, Median = 66, Range = 82