Keystones — Capstone
Five GCSE retrieval questions · 30 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 8
Answer: 5(x + 1)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 51°. Give your answer to 2 decimal places
Answer: 134.06cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 27:12:10 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 56, 79, 68, 45, 19, 50, 35, 88. Give your answer to 2 decimal places
Answer: Mean = 52.89, Median = 50, Range = 69