Keystones — Capstone
Five GCSE retrieval questions · 17 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 12
Answer: 4(x + 5)² - 112 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 77°. Give your answer to 2 decimal places
Answer: 272.82cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 44, 38, 82, 81, 27, 81, 98. Give your answer to 2 decimal places
Answer: Mean = 59.63, Median = 62.5, Range = 72