Keystones — Capstone
Five GCSE retrieval questions · 13 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√176
Answer: 16√11 -
2. Algebra Completing the square
Complete the square: x² - x + 7
Answer: (x - 1⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 17cm, angle = 52°. Give your answer to 2 decimal places
Answer: 93.77cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 90, 15, 89, 65, 36, 93, 33. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 62.5, Range = 78