Keystones — Capstone
Five GCSE retrieval questions · 30 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 14
Answer: 3(x + 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 23cm, angle = 72°. Give your answer to 2 decimal places
Answer: 284.37cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 10:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 74, 82, 10, 21, 56, 97, 89, 13. Give your answer to 2 decimal places
Answer: Mean = 55.56, Median = 58, Range = 87