Keystones — Capstone
Five GCSE retrieval questions · 25 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 8
Answer: 4(x - 5)² - 92 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 23cm, angle = 79°. Give your answer to 2 decimal places
Answer: 270.93cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 36:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 16, 20, 66, 90, 17, 12, 93
Answer: Mean = 50.25, Median = 43, Range = 81