Keystones — Capstone
Five GCSE retrieval questions · 30 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: x² + 3x - 3
Answer: (x + 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 64°. Give your answer to 2 decimal places
Answer: 134.37cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 45:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 67, 27, 40, 60, 36, 62, 96. Give your answer to 2 decimal places
Answer: Mean = 52.13, Median = 50, Range = 69