Keystones — Capstone
Five GCSE retrieval questions · 30 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
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 = 26cm, b = 12cm, angle = 48°. Give your answer to 2 decimal places
Answer: 115.93cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 4:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 90, 76, 74, 17, 40, 32. Give your answer to 2 decimal places
Answer: Mean = 60.14, Median = 74, Range = 75