Keystones — Capstone
Five GCSE retrieval questions · 16 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√50
Answer: 25√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 6
Answer: 5(x + 2)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 40°. Give your answer to 2 decimal places
Answer: 107.99cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:14:10 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 49, 84, 53, 29, 42, 94
Answer: Mean = 58, Median = 53, Range = 65