Keystones — Capstone
Five GCSE retrieval questions · 13 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√176
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² + x + 7
Answer: (x + 1⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 16cm, angle = 71°. Give your answer to 2 decimal places
Answer: 196.67cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 35:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 81, 57, 56, 84, 38, 22. Give your answer to 2 decimal places
Answer: Mean = 58.43, Median = 57, Range = 62