Keystones — Capstone
Five GCSE retrieval questions · 17 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 7
Answer: (x - 9⁄2)² - 109⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 28cm, angle = 72°. Give your answer to 2 decimal places
Answer: 359.5cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 8:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 88, 39, 10, 10, 61, 95, 11. Give your answer to 2 decimal places
Answer: Mean = 41.63, Median = 29, Range = 85