Keystones — Capstone
Five GCSE retrieval questions · 11 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² - 7x - 3
Answer: (x - 7⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 64°. Give your answer to 2 decimal places
Answer: 251.66cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 45:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 19, 43, 39, 66, 81, 33, 69, 98. Give your answer to 2 decimal places
Answer: Mean = 54.56, Median = 43, Range = 79