Keystones — Capstone
Five GCSE retrieval questions · 27 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 3x² + 18x + 2
Answer: 3(x + 3)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 29cm, angle = 59°. Give your answer to 2 decimal places
Answer: 348.01cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 28:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 68, 82, 88, 36, 55, 25, 74. Give your answer to 2 decimal places
Answer: Mean = 62.63, Median = 70.5, Range = 63