Keystones — Capstone
Five GCSE retrieval questions · 3 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: x² + 5x - 10
Answer: (x + 5⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 66°. Give your answer to 2 decimal places
Answer: 182.71cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 72:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 30, 38, 58, 58, 41, 10. Give your answer to 2 decimal places
Answer: Mean = 38.43, Median = 38, Range = 48