Keystones — Capstone
Five GCSE retrieval questions · 2 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 9
Answer: 4(x + 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 49°. Give your answer to 2 decimal places
Answer: 135.85cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 50, 54, 23, 30, 42, 21, 86
Answer: Mean = 49, Median = 46, Range = 65