Keystones — Capstone
Five GCSE retrieval questions · 31 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 10
Answer: 2(x + 3)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 19cm, angle = 40°. Give your answer to 2 decimal places
Answer: 134.34cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 9:12:2 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 27, 20, 42, 18, 30, 37, 16. Give your answer to 2 decimal places
Answer: Mean = 29.88, Median = 28.5, Range = 33