Keystones — Capstone
Five GCSE retrieval questions · 21 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 6
Answer: 3(x + 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 62°. Give your answer to 2 decimal places
Answer: 127.14cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 15, 81, 79, 78, 48, 68, 98, 10. Give your answer to 2 decimal places
Answer: Mean = 61.33, Median = 75, Range = 88