Keystones — Capstone
Five GCSE retrieval questions · 18 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 5
Answer: 3(x - 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 26cm, angle = 74°. Give your answer to 2 decimal places
Answer: 287.42cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 4:24:9 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 62, 62, 19, 82, 14, 98, 52, 19. Give your answer to 2 decimal places
Answer: Mean = 51.56, Median = 56, Range = 84