Keystones — Capstone
Five GCSE retrieval questions · 2 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√125
Answer: 20√5 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 12
Answer: 2(x - 5)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 75°. Give your answer to 2 decimal places
Answer: 222.16cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 42:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 29, 26, 92, 19, 59, 71, 100, 56. Give your answer to 2 decimal places
Answer: Mean = 60.78, Median = 59, Range = 81