Keystones — Capstone
Five GCSE retrieval questions · 11 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 13
Answer: 3(x + 5)² - 62 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 14cm, angle = 41°. Give your answer to 2 decimal places
Answer: 59.7cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 73, 49, 44, 88, 21, 22, 39, 73. Give your answer to 2 decimal places
Answer: Mean = 47.78, Median = 44, Range = 67