Keystones — Capstone
Five GCSE retrieval questions · 27 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 7x + 4
Answer: (x - 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 16cm, angle = 54°. Give your answer to 2 decimal places
Answer: 142.39cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 4:36:45 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 79, 70, 39, 30, 15, 66. Give your answer to 2 decimal places
Answer: Mean = 53.86, Median = 66, Range = 64