Keystones — Capstone
Five GCSE retrieval questions · 22 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: x² + 11x + 5
Answer: (x + 11⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 17cm, angle = 67°. Give your answer to 2 decimal places
Answer: 133.01cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 59, 16, 33, 14, 77, 95, 50, 75. Give your answer to 2 decimal places
Answer: Mean = 49.78, Median = 50, Range = 81