Keystones — Capstone
Five GCSE retrieval questions · 12 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√54
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 11
Answer: 5(x + 2)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 12cm, angle = 60°. Give your answer to 2 decimal places
Answer: 129.9cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 34, 70, 35, 28, 79, 40, 76. Give your answer to 2 decimal places
Answer: Mean = 48.63, Median = 37.5, Range = 52