Keystones — Capstone
Five GCSE retrieval questions · 27 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√3 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 11
Answer: 4(x - 6)² - 155 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 78°. Give your answer to 2 decimal places
Answer: 354.58cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:30:54 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 63, 40, 98, 53, 74, 80, 51, 11. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 53, Range = 88