Keystones — Capstone
Five GCSE retrieval questions · 3 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 9x + 10
Answer: (x - 9⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 26cm, angle = 60°. Give your answer to 2 decimal places
Answer: 135.cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 45, 15, 48, 93, 55, 78, 54. Give your answer to 2 decimal places
Answer: Mean = 54.38, Median = 51, Range = 78