Keystones — Capstone
Five GCSE retrieval questions · 13 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√75
Answer: 15√3 -
2. Algebra Completing the square
Complete the square: x² - 5x
Answer: (x - 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 77°. Give your answer to 2 decimal places
Answer: 236.77cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 27, 20, 70, 82, 30, 41, 79, 99. Give your answer to 2 decimal places
Answer: Mean = 60.33, Median = 70, Range = 79