Keystones — Capstone
Five GCSE retrieval questions · 27 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√63
Answer: 15√7 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 2
Answer: 2(x + 4)² - 34 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 23cm, angle = 55°. Give your answer to 2 decimal places
Answer: 150.72cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 63:45:10 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 58, 29, 87, 90, 26, 11, 29. Give your answer to 2 decimal places
Answer: Mean = 46.13, Median = 34, Range = 79