Keystones — Capstone
Five GCSE retrieval questions · 25 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: x² + 5x + 1
Answer: (x + 5⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 48°. Give your answer to 2 decimal places
Answer: 241.52cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 14:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 69, 24, 26, 64, 90, 53, 66
Answer: Mean = 61, Median = 65, Range = 72