Keystones — Capstone
Five GCSE retrieval questions · 25 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 6
Answer: 5(x - 6)² - 174 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 15cm, angle = 49°. Give your answer to 2 decimal places
Answer: 124.53cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 14:6:3 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 31, 78, 69, 62, 17, 70, 39
Answer: Mean = 47.75, Median = 50.5, Range = 62