Keystones — Capstone
Five GCSE retrieval questions · 20 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 15
Answer: 2(x - 5)² - 35 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 18cm, angle = 54°. Give your answer to 2 decimal places
Answer: 101.94cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 45:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 89, 51, 82, 96, 46, 51, 56
Answer: Mean = 67.25, Median = 61.5, Range = 50