Keystones — Capstone
Five GCSE retrieval questions · 22 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 8
Answer: 2(x - 5)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 30cm, angle = 71°. Give your answer to 2 decimal places
Answer: 411.3cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 76, 43, 34, 22, 81, 88, 62. Give your answer to 2 decimal places
Answer: Mean = 53.88, Median = 52.5, Range = 66