Keystones — Capstone
Five GCSE retrieval questions · 21 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √50
Answer: 5√2 -
2. Algebra Completing the square
Complete the square: x² + 9x - 11
Answer: (x + 9⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 19cm, angle = 41°. Give your answer to 2 decimal places
Answer: 168.28cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 9:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 56, 86, 95, 69, 54, 56. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 56, Range = 41