Keystones — Capstone
Five GCSE retrieval questions · 2 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 5
Answer: 3(x + 6)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 18cm, angle = 72°. Give your answer to 2 decimal places
Answer: 231.11cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 20:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 79, 54, 20, 82, 64, 37, 37, 93. Give your answer to 2 decimal places
Answer: Mean = 54.78, Median = 54, Range = 73