Keystones — Capstone
Five GCSE retrieval questions · 13 October 2014 · 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 + x + 3
Answer: (x + 1⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 66°. Give your answer to 2 decimal places
Answer: 369.99cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 79, 75, 31, 58, 35, 79, 17, 43. Give your answer to 2 decimal places
Answer: Mean = 50.22, Median = 43, Range = 62