Keystones — Capstone
Five GCSE retrieval questions · 8 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² + x + 8
Answer: (x + 1⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 23cm, angle = 52°. Give your answer to 2 decimal places
Answer: 199.37cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 36:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 89, 17, 10, 49, 45, 90, 12
Answer: Mean = 42.25, Median = 35.5, Range = 80