Keystones — Capstone
Five GCSE retrieval questions · 24 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + x + 2
Answer: (x + 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 311.35cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 39, 79, 27, 23, 94, 96, 24
Answer: Mean = 49.25, Median = 33, Range = 84