Keystones — Capstone
Five GCSE retrieval questions · 18 July 2010 · 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 - 3x + 9
Answer: (x - 3⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 20cm, angle = 40°. Give your answer to 2 decimal places
Answer: 173.55cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 28:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 54, 83, 72, 18, 44, 88. Give your answer to 2 decimal places
Answer: Mean = 55.86, Median = 54, Range = 70