Keystones — Capstone
Five GCSE retrieval questions · 23 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² + 7x - 6
Answer: (x + 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 72°. Give your answer to 2 decimal places
Answer: 123.64cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 10:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 58, 31, 52, 44, 31, 90, 27
Answer: Mean = 50.25, Median = 48, Range = 63