Keystones — Capstone
Five GCSE retrieval questions · 21 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² + 3x - 11
Answer: (x + 3⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 16cm, angle = 60°. Give your answer to 2 decimal places
Answer: 138.56cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 47, 55, 84, 30, 49, 72. Give your answer to 2 decimal places
Answer: Mean = 51.29, Median = 49, Range = 62