Keystones — Capstone
Five GCSE retrieval questions · 3 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - x - 12
Answer: (x - 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 15cm, angle = 80°. Give your answer to 2 decimal places
Answer: 199.42cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 32:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 37, 80, 57, 67, 26, 82, 91
Answer: Mean = 62.25, Median = 62.5, Range = 65