Keystones — Capstone
Five GCSE retrieval questions · 30 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 24cm, angle = 77°. Give your answer to 2 decimal places
Answer: 152cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 12:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 71, 78, 77, 63, 62, 44, 21. Give your answer to 2 decimal places
Answer: Mean = 55.13, Median = 62.5, Range = 57