Keystones — Capstone
Five GCSE retrieval questions · 10 January 2016 · 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 + 7x
Answer: (x + 7⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 45°. Give your answer to 2 decimal places
Answer: 171.83cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:35:56 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 22, 91, 46, 23, 86, 22. Give your answer to 2 decimal places
Answer: Mean = 45.14, Median = 26, Range = 69