Keystones — Capstone
Five GCSE retrieval questions · 25 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 5x + 6
Answer: (x + 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 26cm, angle = 59°. Give your answer to 2 decimal places
Answer: 300.87cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 5:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 41, 18, 90, 84, 85, 35, 70
Answer: Mean = 55, Median = 55.5, Range = 73