Keystones — Capstone
Five GCSE retrieval questions · 29 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 4
Answer: 4(x + 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 26cm, angle = 73°. Give your answer to 2 decimal places
Answer: 285.94cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 28:63:18 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 55, 37, 75, 20, 70, 68, 88, 91. Give your answer to 2 decimal places
Answer: Mean = 60.56, Median = 68, Range = 71