Keystones — Capstone
Five GCSE retrieval questions · 28 March 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 3
Answer: 5(x + 6)² - 177 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 15cm, angle = 55°. Give your answer to 2 decimal places
Answer: 135.16cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 8:72:9 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 30, 67, 10, 36, 81, 31
Answer: Mean = 48, Median = 36, Range = 71