Keystones — Capstone
Five GCSE retrieval questions · 3 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 13
Answer: 5(x - 4)² - 67 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 42°. Give your answer to 2 decimal places
Answer: 86.99cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 57, 20, 18, 64, 31, 92, 65, 81. Give your answer to 2 decimal places
Answer: Mean = 48.67, Median = 57, Range = 82