Keystones — Capstone
Five GCSE retrieval questions · 9 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² + 3x - 12
Answer: (x + 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 48°. Give your answer to 2 decimal places
Answer: 114.44cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 63, 92, 10, 92, 86, 20, 67, 41. Give your answer to 2 decimal places
Answer: Mean = 59.22, Median = 63, Range = 82