Keystones — Capstone
Five GCSE retrieval questions · 6 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² - 9x - 12
Answer: (x - 9⁄2)² - 129⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 64°. Give your answer to 2 decimal places
Answer: 325.81cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 90, 39, 91, 13, 74, 70, 39, 53. Give your answer to 2 decimal places
Answer: Mean = 57.89, Median = 53, Range = 78