Keystones — Capstone
Five GCSE retrieval questions · 18 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
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 = 22cm, b = 25cm, angle = 49°. Give your answer to 2 decimal places
Answer: 207.55cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 72:63:56 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 63, 13, 27, 13, 15, 69, 25, 98. Give your answer to 2 decimal places
Answer: Mean = 43.78, Median = 27, Range = 85