Keystones — Capstone
Five GCSE retrieval questions · 22 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 51°. Give your answer to 2 decimal places
Answer: 139.89cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 12:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 81, 92, 67, 12, 36, 25
Answer: Mean = 49, Median = 36, Range = 80