Keystones — Capstone
Five GCSE retrieval questions · 5 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 77°. Give your answer to 2 decimal places
Answer: 231.9cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 8:36:9 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 46, 18, 55, 61, 90, 81, 24
Answer: Mean = 52.25, Median = 50.5, Range = 72