Keystones — Capstone
Five GCSE retrieval questions · 6 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² + 3x - 11
Answer: (x + 3⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 28cm, angle = 40°. Give your answer to 2 decimal places
Answer: 116.99cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 74, 68, 35, 65, 11, 64. Give your answer to 2 decimal places
Answer: Mean = 46.86, Median = 64, Range = 63