Keystones — Capstone
Five GCSE retrieval questions · 5 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 7
Answer: (x + 9⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 68°. Give your answer to 2 decimal places
Answer: 350.48cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 14, 15, 18, 55, 11, 76, 90, 52. Give your answer to 2 decimal places
Answer: Mean = 45.56, Median = 52, Range = 79