Keystones — Capstone
Five GCSE retrieval questions · 21 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: 5x² - 60x - 2
Answer: 5(x - 6)² - 182 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 44°. Give your answer to 2 decimal places
Answer: 125.04cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 35:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 44, 13, 47, 36, 65, 96, 41, 13. Give your answer to 2 decimal places
Answer: Mean = 49.89, Median = 44, Range = 83