Keystones — Capstone
Five GCSE retrieval questions · 14 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 5x² + 50x - 9
Answer: 5(x + 5)² - 134 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 25cm, angle = 45°. Give your answer to 2 decimal places
Answer: 238.65cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 45:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 35, 56, 45, 86, 23, 12, 65, 58. Give your answer to 2 decimal places
Answer: Mean = 51.44, Median = 56, Range = 74