Keystones — Capstone
Five GCSE retrieval questions · 16 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 8
Answer: 2(x - 1)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 60°. Give your answer to 2 decimal places
Answer: 101.32cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:72:16 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 65, 21, 87, 54, 34, 75. Give your answer to 2 decimal places
Answer: Mean = 53.86, Median = 54, Range = 66