Keystones — Capstone
Five GCSE retrieval questions · 19 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 8
Answer: 5(x - 4)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 25cm, angle = 59°. Give your answer to 2 decimal places
Answer: 300.01cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 9:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 36, 27, 32, 79, 40, 16, 24, 30. Give your answer to 2 decimal places
Answer: Mean = 32.89, Median = 30, Range = 67