Keystones — Capstone
Five GCSE retrieval questions · 11 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√63
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 1
Answer: 3(x + 5)² - 74 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 14cm, angle = 66°. Give your answer to 2 decimal places
Answer: 115.11cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 6:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 91, 44, 65, 99, 30, 96, 86, 73. Give your answer to 2 decimal places
Answer: Mean = 74.78, Median = 86, Range = 69