Keystones — Capstone
Five GCSE retrieval questions · 27 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² + 5x - 1
Answer: (x + 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 22cm, angle = 70°. Give your answer to 2 decimal places
Answer: 206.73cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 20:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 55, 83, 46, 85, 47, 68, 51. Give your answer to 2 decimal places
Answer: Mean = 62.38, Median = 59.5, Range = 39