Keystones — Capstone
Five GCSE retrieval questions · 20 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 + 9x
Answer: (x + 9⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 69°. Give your answer to 2 decimal places
Answer: 123.23cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 21:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 82, 14, 92, 81, 42, 16. Give your answer to 2 decimal places
Answer: Mean = 51.43, Median = 42, Range = 78