Keystones — Capstone
Five GCSE retrieval questions · 6 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: x² - 11x - 11
Answer: (x - 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 30cm, angle = 60°. Give your answer to 2 decimal places
Answer: 194.86cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:63:18 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 85, 91, 45, 27, 90, 13, 81, 76. Give your answer to 2 decimal places
Answer: Mean = 60.78, Median = 76, Range = 78