Keystones — Capstone
Five GCSE retrieval questions · 27 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² + 3x + 5
Answer: (x + 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 26cm, angle = 64°. Give your answer to 2 decimal places
Answer: 292.11cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 45:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 11, 73, 59, 62, 29, 83, 87, 45. Give your answer to 2 decimal places
Answer: Mean = 51.11, Median = 59, Range = 76