Keystones — Capstone
Five GCSE retrieval questions · 4 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 2
Answer: (x - 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 43°. Give your answer to 2 decimal places
Answer: 122.76cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:30:12 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 92, 65, 51, 76, 29, 49, 96
Answer: Mean = 65.25, Median = 64.5, Range = 67