Keystones — Capstone
Five GCSE retrieval questions · 7 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² - 3x + 2
Answer: (x - 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 20cm, angle = 55°. Give your answer to 2 decimal places
Answer: 122.87cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 66, 15, 90, 31, 77, 45, 32, 81
Answer: Mean = 58, Median = 66, Range = 75