Keystones — Capstone
Five GCSE retrieval questions · 12 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: x² - 3x - 5
Answer: (x - 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 13cm, angle = 54°. Give your answer to 2 decimal places
Answer: 131.47cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 63:35:5 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 22, 28, 34, 89, 18, 85, 67. Give your answer to 2 decimal places
Answer: Mean = 47.88, Median = 37, Range = 71