Keystones — Capstone
Five GCSE retrieval questions · 8 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 5
Answer: 3(x + 2)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 27cm, angle = 59°. Give your answer to 2 decimal places
Answer: 162cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 13, 13, 41, 86, 90, 46, 53, 22. Give your answer to 2 decimal places
Answer: Mean = 42.56, Median = 41, Range = 77