Keystones — Capstone
Five GCSE retrieval questions · 14 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 8
Answer: 3(x + 5)² - 67 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 65°. Give your answer to 2 decimal places
Answer: 235.64cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 6:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 78, 30, 95, 11, 78, 14, 22. Give your answer to 2 decimal places
Answer: Mean = 44.38, Median = 28.5, Range = 84