Keystones — Capstone
Five GCSE retrieval questions · 12 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 3
Answer: 2(x + 5)² - 53 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 13cm, angle = 47°. Give your answer to 2 decimal places
Answer: 90.32cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 14:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 19, 83, 56, 77, 28, 42, 88
Answer: Mean = 61.5, Median = 66.5, Range = 80