Keystones — Capstone
Five GCSE retrieval questions · 14 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√50
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: x² - 5x + 9
Answer: (x - 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 14cm, angle = 62°. Give your answer to 2 decimal places
Answer: 98.89cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 15:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 85, 34, 26, 44, 86, 76, 78
Answer: Mean = 59.75, Median = 62.5, Range = 60