Keystones — Capstone
Five GCSE retrieval questions · 12 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² + 11x + 9
Answer: (x + 11⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 12cm, angle = 71°. Give your answer to 2 decimal places
Answer: 124.81cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 3:12:10 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 12, 52, 65, 85, 80, 69, 99
Answer: Mean = 68, Median = 74.5, Range = 87