Keystones — Capstone
Five GCSE retrieval questions · 3 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 4
Answer: 4(x - 4)² - 68 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 19cm, angle = 62°. Give your answer to 2 decimal places
Answer: 159.37cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 13, 44, 13, 25, 52, 65, 35, 95. Give your answer to 2 decimal places
Answer: Mean = 41.33, Median = 35, Range = 82