Keystones — Capstone
Five GCSE retrieval questions · 18 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 26cm, angle = 66°. Give your answer to 2 decimal places
Answer: 308.78cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 27:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 95, 41, 59, 26, 23, 35, 43, 88. Give your answer to 2 decimal places
Answer: Mean = 53.67, Median = 43, Range = 72