Keystones — Capstone
Five GCSE retrieval questions · 19 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² + 7x + 6
Answer: (x + 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 67°. Give your answer to 2 decimal places
Answer: 241.63cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 68, 82, 54, 63, 67, 30, 96
Answer: Mean = 60, Median = 65, Range = 76