Keystones — Capstone
Five GCSE retrieval questions · 26 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√125
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: x² + x + 12
Answer: (x + 1⁄2)² + 47⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 45°. Give your answer to 2 decimal places
Answer: 141.07cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 21:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 13, 12, 76, 19, 93, 48, 83, 36. Give your answer to 2 decimal places
Answer: Mean = 53.11, Median = 48, Range = 86