Keystones — Capstone
Five GCSE retrieval questions · 25 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: 4x² + 16x - 7
Answer: 4(x + 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 28cm, angle = 69°. Give your answer to 2 decimal places
Answer: 235.26cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 47, 86, 71, 18, 15, 99, 69, 85. Give your answer to 2 decimal places
Answer: Mean = 63.44, Median = 71, Range = 84