Keystones — Capstone
Five GCSE retrieval questions · 17 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² - 5x - 5
Answer: (x - 5⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 24cm, angle = 55°. Give your answer to 2 decimal places
Answer: 226.09cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 60, 45, 19, 56, 63, 46, 55, 74. Give your answer to 2 decimal places
Answer: Mean = 49.67, Median = 55, Range = 55