Keystones — Capstone
Five GCSE retrieval questions · 26 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √684
Answer: 6√19 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 9
Answer: 3(x - 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 29cm, angle = 71°. Give your answer to 2 decimal places
Answer: 411.3cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 54:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 80, 11, 27, 66, 35, 90, 58. Give your answer to 2 decimal places
Answer: Mean = 57.13, Median = 62, Range = 79