Keystones — Capstone
Five GCSE retrieval questions · 31 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 12
Answer: 3(x + 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 58°. Give your answer to 2 decimal places
Answer: 320.56cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 54:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 86, 17, 83, 88, 87, 21, 11
Answer: Mean = 59, Median = 81, Range = 77