Keystones — Capstone
Five GCSE retrieval questions · 20 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 3
Answer: 3(x - 3)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 19cm, angle = 64°. Give your answer to 2 decimal places
Answer: 247.62cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 55, 49, 81, 55, 92, 20, 61, 93. Give your answer to 2 decimal places
Answer: Mean = 64.89, Median = 61, Range = 73