Keystones — Capstone
Five GCSE retrieval questions · 20 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√63
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: 2x² - 12x + 1
Answer: 2(x - 3)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 52°. Give your answer to 2 decimal places
Answer: 126.87cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 42:35:25 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 66, 53, 81, 48, 77, 10, 62, 96. Give your answer to 2 decimal places
Answer: Mean = 63.33, Median = 66, Range = 86