Keystones — Capstone
Five GCSE retrieval questions · 23 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 4
Answer: 5(x + 6)² - 184 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 12cm, angle = 55°. Give your answer to 2 decimal places
Answer: 132.7cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 14:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 100, 97, 80, 39, 65, 96, 69
Answer: Mean = 74, Median = 74.5, Range = 61