Keystones — Capstone
Five GCSE retrieval questions · 14 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: x² + 11x - 11
Answer: (x + 11⁄2)² - 165⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 60°. Give your answer to 2 decimal places
Answer: 222.14cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 27:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 72, 10, 21, 67, 32, 78
Answer: Mean = 46, Median = 42, Range = 68