Keystones — Capstone
Five GCSE retrieval questions · 29 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² - 5x + 8
Answer: (x - 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 13cm, angle = 67°. Give your answer to 2 decimal places
Answer: 83.77cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:42:54 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 100, 76, 95, 94, 30, 25
Answer: Mean = 65, Median = 76, Range = 75