Keystones — Capstone
Five GCSE retrieval questions · 28 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√63
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 7x - 4
Answer: (x - 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 47°. Give your answer to 2 decimal places
Answer: 197.47cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 28, 76, 48, 94, 82, 16, 52, 63. Give your answer to 2 decimal places
Answer: Mean = 58.44, Median = 63, Range = 78