Keystones — Capstone
Five GCSE retrieval questions · 23 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 9x - 11
Answer: (x - 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 23cm, angle = 80°. Give your answer to 2 decimal places
Answer: 339.76cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 8:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 48, 70, 34, 65, 36, 76, 17. Give your answer to 2 decimal places
Answer: Mean = 54.13, Median = 56.5, Range = 70