Keystones — Capstone
Five GCSE retrieval questions · 14 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 8
Answer: 3(x - 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 13cm, angle = 69°. Give your answer to 2 decimal places
Answer: 78.89cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 20:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 14, 51, 71, 75, 49, 67, 83, 28
Answer: Mean = 54, Median = 51, Range = 69