Keystones — Capstone
Five GCSE retrieval questions · 18 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: x² - 9x + 12
Answer: (x - 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 63°. Give your answer to 2 decimal places
Answer: 347.49cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 14:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 76, 15, 64, 13, 43, 65, 18, 17. Give your answer to 2 decimal places
Answer: Mean = 45.11, Median = 43, Range = 82