Keystones — Capstone
Five GCSE retrieval questions · 2 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 5
Answer: 5(x - 6)² - 175 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 24cm, angle = 80°. Give your answer to 2 decimal places
Answer: 212.72cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 3:6:14 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 59, 22, 91, 80, 12, 74. Give your answer to 2 decimal places
Answer: Mean = 55.43, Median = 59, Range = 79