Keystones — Capstone
Five GCSE retrieval questions · 9 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 3x - 10
Answer: (x + 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 67°. Give your answer to 2 decimal places
Answer: 207.11cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 18:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 46, 32, 96, 14, 36, 16
Answer: Mean = 46, Median = 36, Range = 82