Keystones — Capstone
Five GCSE retrieval questions · 15 August 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: 2x² + 12x + 8
Answer: 2(x + 3)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 25cm, angle = 80°. Give your answer to 2 decimal places
Answer: 332.37cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 15:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 66, 53, 38, 92, 59, 77, 18, 29. Give your answer to 2 decimal places
Answer: Mean = 50.89, Median = 53, Range = 74