Keystones — Capstone
Five GCSE retrieval questions · 27 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√150
Answer: 15√6 -
2. Algebra Completing the square
Complete the square: x² - x + 7
Answer: (x - 1⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 53°. Give your answer to 2 decimal places
Answer: 219.62cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:20:4 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 50, 26, 71, 90, 33, 50. Give your answer to 2 decimal places
Answer: Mean = 52.43, Median = 50, Range = 64