Keystones — Capstone
Five GCSE retrieval questions · 10 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - 5x - 12
Answer: (x - 5⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 41°. Give your answer to 2 decimal places
Answer: 144.99cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:40:56 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 60, 58, 72, 27, 35, 53, 95, 91. Give your answer to 2 decimal places
Answer: Mean = 63.44, Median = 60, Range = 68