Keystones — Capstone
Five GCSE retrieval questions · 15 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 3
Answer: 2(x - 5)² - 53 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 25cm, angle = 75°. Give your answer to 2 decimal places
Answer: 144.89cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 42:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 75, 22, 86, 64, 64, 95. Give your answer to 2 decimal places
Answer: Mean = 67.86, Median = 69, Range = 73