Keystones — Capstone
Five GCSE retrieval questions · 24 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 10
Answer: (x + 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 66°. Give your answer to 2 decimal places
Answer: 234.32cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 43, 38, 72, 44, 53, 24, 82. Give your answer to 2 decimal places
Answer: Mean = 52.63, Median = 48.5, Range = 58