Keystones — Capstone
Five GCSE retrieval questions · 19 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² + 3x + 7
Answer: (x + 3⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 25cm, angle = 59°. Give your answer to 2 decimal places
Answer: 300.01cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 6:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 67, 43, 43, 71, 50, 77, 34, 49. Give your answer to 2 decimal places
Answer: Mean = 55.22, Median = 50, Range = 43