Keystones — Capstone
Five GCSE retrieval questions · 6 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² + x + 9
Answer: (x + 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 48°. Give your answer to 2 decimal places
Answer: 280.91cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 10:14:21 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 90, 63, 21, 51, 48, 82, 29, 27. Give your answer to 2 decimal places
Answer: Mean = 47.22, Median = 48, Range = 76