Keystones — Capstone
Five GCSE retrieval questions · 10 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² + 9x + 2
Answer: (x + 9⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 25cm, angle = 60°. Give your answer to 2 decimal places
Answer: 292.28cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 12:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 30, 22, 14, 88, 86, 28, 58, 10. Give your answer to 2 decimal places
Answer: Mean = 38.56, Median = 28, Range = 78