Keystones — Capstone
Five GCSE retrieval questions · 11 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 14
Answer: 4(x + 2)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 14cm, angle = 68°. Give your answer to 2 decimal places
Answer: 194.71cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:10:2 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 41, 69, 27, 53, 77, 36, 75, 34. Give your answer to 2 decimal places
Answer: Mean = 54.89, Median = 53, Range = 55