Keystones — Capstone
Five GCSE retrieval questions · 13 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² + 3x + 2
Answer: (x + 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 78°. Give your answer to 2 decimal places
Answer: 168.73cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:30:54 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 34, 80, 64, 42, 60, 89, 95, 29. Give your answer to 2 decimal places
Answer: Mean = 60.78, Median = 60, Range = 66