Keystones — Capstone
Five GCSE retrieval questions · 3 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 8
Answer: 3(x - 5)² - 67 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 60°. Give your answer to 2 decimal places
Answer: 77.94cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 93, 84, 38, 12, 43, 83, 63
Answer: Mean = 55.75, Median = 53, Range = 81