Keystones — Capstone
Five GCSE retrieval questions · 29 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: x² + x - 5
Answer: (x + 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 76°. Give your answer to 2 decimal places
Answer: 178.53cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 95, 98, 13, 33, 53, 98, 62
Answer: Mean = 64.25, Median = 62, Range = 85