Keystones — Capstone
Five GCSE retrieval questions · 31 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 13cm, angle = 76°. Give your answer to 2 decimal places
Answer: 176.59cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 6:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 97, 75, 95, 26, 48, 32, 23
Answer: Mean = 60.25, Median = 61.5, Range = 74