Keystones — Capstone
Five GCSE retrieval questions · 22 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
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 = 23cm, b = 15cm, angle = 49°. Give your answer to 2 decimal places
Answer: 130.19cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 9:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 33, 29, 24, 44, 88, 60, 40, 60. Give your answer to 2 decimal places
Answer: Mean = 43.44, Median = 40, Range = 75