Keystones — Capstone
Five GCSE retrieval questions · 14 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 45°. Give your answer to 2 decimal places
Answer: 256.33cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 40, 77, 36, 55, 24, 20, 45, 24. Give your answer to 2 decimal places
Answer: Mean = 42.22, Median = 40, Range = 57