Keystones — Capstone
Five GCSE retrieval questions · 22 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√50
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 29cm, angle = 46°. Give your answer to 2 decimal places
Answer: 271.19cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 21:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 82, 44, 69, 78, 71, 24, 30, 78. Give your answer to 2 decimal places
Answer: Mean = 63.33, Median = 71, Range = 70