Keystones — Capstone
Five GCSE retrieval questions · 9 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 12
Answer: 5(x + 6)² - 192 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 43°. Give your answer to 2 decimal places
Answer: 221.65cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 63:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 61, 93, 57, 21, 33, 46, 95, 22
Answer: Mean = 52, Median = 46, Range = 74