Keystones — Capstone
Five GCSE retrieval questions · 9 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² - 5x - 4
Answer: (x - 5⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 13cm, angle = 76°. Give your answer to 2 decimal places
Answer: 176.59cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 2:6:9 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 83, 18, 89, 96, 18, 22. Give your answer to 2 decimal places
Answer: Mean = 52.43, Median = 41, Range = 78