Keystones — Capstone
Five GCSE retrieval questions · 7 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² + 7x - 7
Answer: (x + 7⁄2)² - 77⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 14cm, angle = 52°. Give your answer to 2 decimal places
Answer: 77.23cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 75, 60, 13, 83, 23, 68. Give your answer to 2 decimal places
Answer: Mean = 47.86, Median = 60, Range = 70