Keystones — Capstone
Five GCSE retrieval questions · 10 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 2x² - 12x + 15
Answer: 2(x - 3)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 13cm, angle = 59°. Give your answer to 2 decimal places
Answer: 150.43cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 15:24:28 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 85, 30, 62, 95, 11, 36, 17, 74. Give your answer to 2 decimal places
Answer: Mean = 54.67, Median = 62, Range = 84