Keystones — Capstone
Five GCSE retrieval questions · 6 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 4
Answer: 5(x + 6)² - 176 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 15cm, angle = 49°. Give your answer to 2 decimal places
Answer: 135.85cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 32:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 58, 90, 86, 47, 12, 86, 21, 58. Give your answer to 2 decimal places
Answer: Mean = 56.78, Median = 58, Range = 78