Keystones — Capstone
Five GCSE retrieval questions · 30 March 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 3x² + 6x - 8
Answer: 3(x + 1)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 28cm, angle = 49°. Give your answer to 2 decimal places
Answer: 137.36cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:28:20 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 82, 33, 71, 30, 99, 61, 37. Give your answer to 2 decimal places
Answer: Mean = 62.88, Median = 66, Range = 69