Keystones — Capstone
Five GCSE retrieval questions · 17 May 2010 · 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 + 3x - 6
Answer: (x + 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 16cm, angle = 48°. Give your answer to 2 decimal places
Answer: 71.34cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 32:36:27 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 23, 85, 90, 50, 51, 80. Give your answer to 2 decimal places
Answer: Mean = 60.29, Median = 51, Range = 67