Keystones — Capstone
Five GCSE retrieval questions · 9 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√63
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² + 5x
Answer: (x + 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 20cm, angle = 51°. Give your answer to 2 decimal places
Answer: 139.89cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 6:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 54, 74, 36, 72, 52, 17, 68
Answer: Mean = 49.5, Median = 53, Range = 57