Keystones — Capstone
Five GCSE retrieval questions · 17 December 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: 3x² + 12x + 9
Answer: 3(x + 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 26cm, angle = 63°. Give your answer to 2 decimal places
Answer: 220.08cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 56:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 48, 13, 77, 76, 13, 83, 29
Answer: Mean = 44, Median = 38.5, Range = 70