Keystones — Capstone
Five GCSE retrieval questions · 2 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 7
Answer: 5(x - 2)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 18cm, angle = 46°. Give your answer to 2 decimal places
Answer: 194.22cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:30:6 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 59, 100, 82, 35, 75, 95. Give your answer to 2 decimal places
Answer: Mean = 71.57, Median = 75, Range = 65