Keystones — Capstone
Five GCSE retrieval questions · 1 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 7
Answer: 5(x + 6)² - 187 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 55°. Give your answer to 2 decimal places
Answer: 309.64cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 89, 70, 65, 45, 15, 72, 22, 13. Give your answer to 2 decimal places
Answer: Mean = 51.78, Median = 65, Range = 76