Keystones — Capstone
Five GCSE retrieval questions · 11 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² - x - 7
Answer: (x - 1⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 46°. Give your answer to 2 decimal places
Answer: 134.88cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:10:18 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 92, 31, 73, 44, 31, 77, 81
Answer: Mean = 61.5, Median = 68, Range = 61