Keystones — Capstone
Five GCSE retrieval questions · 25 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² + x + 4
Answer: (x + 1⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 40°. Give your answer to 2 decimal places
Answer: 107.99cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 45:10:6 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 38, 28, 35, 14, 100, 80, 64, 29
Answer: Mean = 47, Median = 35, Range = 86