Keystones — Capstone
Five GCSE retrieval questions · 26 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: x² + 7x + 6
Answer: (x + 7⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 14cm, angle = 49°. Give your answer to 2 decimal places
Answer: 126.79cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 81:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 59, 48, 96, 73, 13, 32. Give your answer to 2 decimal places
Answer: Mean = 58.43, Median = 59, Range = 83