Keystones — Capstone
Five GCSE retrieval questions · 26 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 12
Answer: 5(x - 4)² - 92 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 59°. Give your answer to 2 decimal places
Answer: 66.86cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 95, 55, 10, 32, 55, 34. Give your answer to 2 decimal places
Answer: Mean = 51.57, Median = 55, Range = 85