Keystones — Capstone
Five GCSE retrieval questions · 31 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: x² + 7x - 6
Answer: (x + 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 27cm, angle = 51°. Give your answer to 2 decimal places
Answer: 230.81cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:20:12 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 85, 96, 44, 65, 71, 14, 61. Give your answer to 2 decimal places
Answer: Mean = 60.63, Median = 63, Range = 82