Keystones — Capstone
Five GCSE retrieval questions · 5 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 11
Answer: 3(x - 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 137.52cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 40:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 66, 89, 38, 96, 94, 92, 59, 23. Give your answer to 2 decimal places
Answer: Mean = 67.11, Median = 66, Range = 73