Keystones — Capstone
Five GCSE retrieval questions · 9 May 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: 5x² + 40x + 5
Answer: 5(x + 4)² - 75 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 60°. Give your answer to 2 decimal places
Answer: 213.91cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 17, 77, 27, 60, 87, 10, 57
Answer: Mean = 48.5, Median = 55, Range = 77