Keystones — Capstone
Five GCSE retrieval questions · 20 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√160
Answer: 20√10 -
2. Algebra Completing the square
Complete the square: x² - 9x - 6
Answer: (x - 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 25cm, angle = 51°. Give your answer to 2 decimal places
Answer: 242.86cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 76, 69, 18, 100, 41, 79
Answer: Mean = 66, Median = 76, Range = 82