Keystones — Capstone
Five GCSE retrieval questions · 11 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 66°. Give your answer to 2 decimal places
Answer: 173.57cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 27, 38, 77, 31, 18, 93. Give your answer to 2 decimal places
Answer: Mean = 43.86, Median = 31, Range = 75