Keystones — Capstone
Five GCSE retrieval questions · 20 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
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 = 15cm, b = 25cm, angle = 56°. Give your answer to 2 decimal places
Answer: 155.44cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 49:56:8 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 73, 77, 75, 57, 44, 55. Give your answer to 2 decimal places
Answer: Mean = 65.29, Median = 73, Range = 33