Keystones — Capstone
Five GCSE retrieval questions · 3 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² - 11x + 11
Answer: (x - 11⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 42°. Give your answer to 2 decimal places
Answer: 171.63cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 25, 54, 39, 76, 12, 72, 31, 75. Give your answer to 2 decimal places
Answer: Mean = 47.11, Median = 40, Range = 64