Keystones — Capstone
Five GCSE retrieval questions · 3 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 11
Answer: 3(x + 3)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 13cm, angle = 73°. Give your answer to 2 decimal places
Answer: 180.26cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 85, 28, 43, 70, 35, 46, 30, 91. Give your answer to 2 decimal places
Answer: Mean = 48.89, Median = 43, Range = 79