Keystones — Capstone
Five GCSE retrieval questions · 12 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² + 9x + 2
Answer: (x + 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 26cm, angle = 61°. Give your answer to 2 decimal places
Answer: 341.cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 90, 91, 39, 65, 17, 21
Answer: Mean = 49, Median = 39, Range = 74