Keystones — Capstone
Five GCSE retrieval questions · 16 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 11
Answer: 5(x + 2)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 71°. Give your answer to 2 decimal places
Answer: 382.94cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 56:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 20, 58, 67, 79, 92, 33, 97
Answer: Mean = 63.75, Median = 65.5, Range = 77