Keystones — Capstone
Five GCSE retrieval questions · 30 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 2
Answer: 5(x - 1)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 59°. Give your answer to 2 decimal places
Answer: 189.43cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 49:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 46, 23, 63, 63, 23, 25, 34. Give your answer to 2 decimal places
Answer: Mean = 41.63, Median = 40, Range = 40