Keystones — Capstone
Five GCSE retrieval questions · 29 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 3x² - 6x + 6
Answer: 3(x - 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 26cm, angle = 60°. Give your answer to 2 decimal places
Answer: 258.94cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 15:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 65, 67, 27, 49, 23, 53, 96
Answer: Mean = 58.75, Median = 59, Range = 73