Keystones — Capstone
Five GCSE retrieval questions · 5 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 14
Answer: 5(x + 2)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 30cm, angle = 43°. Give your answer to 2 decimal places
Answer: 235.29cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 54:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 52, 92, 26, 26, 34, 24, 15, 47. Give your answer to 2 decimal places
Answer: Mean = 37.44, Median = 26, Range = 77