Keystones — Capstone
Five GCSE retrieval questions · 5 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 13
Answer: 2(x - 5)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 75°. Give your answer to 2 decimal places
Answer: 104.32cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 48, 97, 54, 47, 100, 80, 93, 82. Give your answer to 2 decimal places
Answer: Mean = 68.11, Median = 80, Range = 88