Keystones — Capstone
Five GCSE retrieval questions · 27 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 5x + 11
Answer: (x + 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 15cm, angle = 64°. Give your answer to 2 decimal places
Answer: 148.3cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 87, 38, 25, 50, 34, 69. Give your answer to 2 decimal places
Answer: Mean = 46.43, Median = 38, Range = 65