Keystones — Capstone
Five GCSE retrieval questions · 28 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² + x - 12
Answer: (x + 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 22cm, angle = 48°. Give your answer to 2 decimal places
Answer: 212.54cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 73, 38, 91, 18, 75, 34, 65
Answer: Mean = 53, Median = 51.5, Range = 73