Keystones — Capstone
Five GCSE retrieval questions · 12 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 3
Answer: 5(x + 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 64°. Give your answer to 2 decimal places
Answer: 157.29cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 18:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 41, 12, 64, 53, 89, 15, 43, 14. Give your answer to 2 decimal places
Answer: Mean = 46.44, Median = 43, Range = 77