Keystones — Capstone
Five GCSE retrieval questions · 31 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√24
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: x² + 5x - 9
Answer: (x + 5⁄2)² - 61⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 71°. Give your answer to 2 decimal places
Answer: 191.94cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 31, 69, 55, 93, 90, 28, 69, 34. Give your answer to 2 decimal places
Answer: Mean = 60.22, Median = 69, Range = 65