Keystones — Capstone
Five GCSE retrieval questions · 23 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 14
Answer: 2(x - 5)² - 36 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 53°. Give your answer to 2 decimal places
Answer: 86.25cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 41, 99, 28, 83, 82, 23, 46, 55
Answer: Mean = 60, Median = 55, Range = 76