Keystones — Capstone
Five GCSE retrieval questions · 26 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² + 5x - 7
Answer: (x + 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 17cm, angle = 42°. Give your answer to 2 decimal places
Answer: 79.63cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 31, 99, 79, 51, 84, 19, 58
Answer: Mean = 55.25, Median = 54.5, Range = 80