Keystones — Capstone
Five GCSE retrieval questions · 3 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 2
Answer: 4(x - 6)² - 146 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 51°. Give your answer to 2 decimal places
Answer: 104.91cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 36, 56, 35, 65, 71, 34, 54, 65
Answer: Mean = 49, Median = 54, Range = 46