Keystones — Capstone
Five GCSE retrieval questions · 25 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 26cm, angle = 80°. Give your answer to 2 decimal places
Answer: 230.45cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 14:18:27 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 12, 55, 69, 36, 28, 59, 65
Answer: Mean = 43.5, Median = 45.5, Range = 57