Keystones — Capstone
Five GCSE retrieval questions · 20 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² + x + 11
Answer: (x + 1⁄2)² + 43⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 75°. Give your answer to 2 decimal places
Answer: 150.68cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 72:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 60, 48, 69, 39, 81, 36, 87, 13. Give your answer to 2 decimal places
Answer: Mean = 51.22, Median = 48, Range = 74