Keystones — Capstone
Five GCSE retrieval questions · 28 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√50
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: x² + x + 5
Answer: (x + 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 67°. Give your answer to 2 decimal places
Answer: 165.69cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 99, 36, 99, 92, 27, 49
Answer: Mean = 65, Median = 53, Range = 72