Keystones — Capstone
Five GCSE retrieval questions · 6 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√20
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 4x² - 24x - 11
Answer: 4(x - 3)² - 47 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 19cm, angle = 55°. Give your answer to 2 decimal places
Answer: 186.77cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 3:6:2 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 62, 96, 77, 82, 96, 58, 78
Answer: Mean = 73.75, Median = 77.5, Range = 55