Keystones — Capstone
Five GCSE retrieval questions · 29 March 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 8
Answer: 3(x - 6)² - 116 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 64°. Give your answer to 2 decimal places
Answer: 198.63cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 49:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 91, 85, 79, 75, 55, 37, 32. Give your answer to 2 decimal places
Answer: Mean = 65.88, Median = 74, Range = 59