Keystones — Capstone
Five GCSE retrieval questions · 1 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: x² + 3x - 1
Answer: (x + 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 17cm, angle = 78°. Give your answer to 2 decimal places
Answer: 207.86cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 27:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 95, 39, 94, 41, 49, 41, 55
Answer: Mean = 53.25, Median = 45, Range = 83