Keystones — Capstone
Five GCSE retrieval questions · 3 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√75
Answer: 25√3 -
2. Algebra Completing the square
Complete the square: x² + 9x + 9
Answer: (x + 9⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 70°. Give your answer to 2 decimal places
Answer: 253.72cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 20, 62, 39, 52, 83, 26
Answer: Mean = 47, Median = 47, Range = 63