Keystones — Capstone
Five GCSE retrieval questions · 17 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√50
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 6
Answer: (x - 3⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 23cm, angle = 80°. Give your answer to 2 decimal places
Answer: 135.9cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 32:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 46, 56, 95, 19, 50, 43, 49
Answer: Mean = 53.75, Median = 49.5, Range = 76