Keystones — Capstone
Five GCSE retrieval questions · 27 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: x² + 5x - 2
Answer: (x + 5⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 41°. Give your answer to 2 decimal places
Answer: 120.71cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 91, 32, 58, 59, 11, 14, 98
Answer: Mean = 50.25, Median = 48.5, Range = 87