Keystones — Capstone
Five GCSE retrieval questions · 19 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 13
Answer: 5(x + 3)² - 32 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 75°. Give your answer to 2 decimal places
Answer: 115.91cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 31, 26, 49, 38, 63, 90, 53, 30. Give your answer to 2 decimal places
Answer: Mean = 51.11, Median = 49, Range = 64