Keystones — Capstone
Five GCSE retrieval questions · 29 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√63
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 10
Answer: (x + 5⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 16cm, angle = 71°. Give your answer to 2 decimal places
Answer: 204.23cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 36:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 15, 93, 95, 33, 45, 62, 51, 100. Give your answer to 2 decimal places
Answer: Mean = 59.89, Median = 51, Range = 85