Keystones — Capstone
Five GCSE retrieval questions · 20 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 14
Answer: 5(x + 6)² - 194 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 75°. Give your answer to 2 decimal places
Answer: 177.73cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 21:56:72 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 16, 76, 13, 74, 14, 63, 44
Answer: Mean = 42, Median = 40, Range = 63