Keystones — Capstone
Five GCSE retrieval questions · 4 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 12
Answer: 2(x + 4)² - 44 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 19cm, angle = 49°. Give your answer to 2 decimal places
Answer: 136.23cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 10:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 63, 42, 13, 96, 36, 80. Give your answer to 2 decimal places
Answer: Mean = 57.86, Median = 63, Range = 83