Keystones — Capstone
Five GCSE retrieval questions · 7 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 2
Answer: 2(x + 6)² - 74 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 22cm, angle = 40°. Give your answer to 2 decimal places
Answer: 155.55cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:10:25 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 82, 76, 39, 84, 87, 67, 19. Give your answer to 2 decimal places
Answer: Mean = 58.88, Median = 71.5, Range = 70