Keystones — Capstone
Five GCSE retrieval questions · 27 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
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 = 15cm, angle = 71°. Give your answer to 2 decimal places
Answer: 156.01cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 77, 68, 73, 74, 95, 18, 26, 91
Answer: Mean = 65.25, Median = 73.5, Range = 77