Keystones — Capstone
Five GCSE retrieval questions · 12 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² - 11x - 11
Answer: (x - 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 23cm, angle = 71°. Give your answer to 2 decimal places
Answer: 315.33cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 45:72:32 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 45, 75, 11, 66, 98, 56, 86, 33. Give your answer to 2 decimal places
Answer: Mean = 55.78, Median = 56, Range = 87