Keystones — Capstone
Five GCSE retrieval questions · 16 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 15
Answer: 3(x - 6)² - 123 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 16cm, angle = 62°. Give your answer to 2 decimal places
Answer: 98.89cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 91, 35, 22, 84, 65, 12, 41, 20. Give your answer to 2 decimal places
Answer: Mean = 45.89, Median = 41, Range = 79