Keystones — Capstone
Five GCSE retrieval questions · 4 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: 5x² + 40x + 4
Answer: 5(x + 4)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 16cm, angle = 51°. Give your answer to 2 decimal places
Answer: 80.82cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 27:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 77, 97, 46, 66, 75, 99. Give your answer to 2 decimal places
Answer: Mean = 75.14, Median = 75, Range = 53