Keystones — Capstone
Five GCSE retrieval questions · 5 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² - 9x + 12
Answer: (x - 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 55°. Give your answer to 2 decimal places
Answer: 127.79cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 30, 27, 58, 17, 66, 86, 20
Answer: Mean = 46, Median = 44, Range = 69