Keystones — Capstone
Five GCSE retrieval questions · 4 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 6
Answer: 2(x + 3)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 186.13cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 28:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 85, 61, 43, 63, 75, 18. Give your answer to 2 decimal places
Answer: Mean = 56.43, Median = 61, Range = 67