Keystones — Capstone
Five GCSE retrieval questions · 22 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² + 9x + 4
Answer: (x + 9⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 14cm, angle = 42°. Give your answer to 2 decimal places
Answer: 88.99cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 36:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 76, 72, 45, 76, 27, 23, 87, 63. Give your answer to 2 decimal places
Answer: Mean = 63.22, Median = 72, Range = 77