Keystones — Capstone
Five GCSE retrieval questions · 19 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 5x + 2
Answer: (x - 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 18cm, angle = 70°. Give your answer to 2 decimal places
Answer: 143.77cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 50, 46, 58, 40, 72, 50, 82
Answer: Mean = 52, Median = 50, Range = 64