Keystones — Capstone
Five GCSE retrieval questions · 8 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² + 3x + 3
Answer: (x + 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 20cm, angle = 56°. Give your answer to 2 decimal places
Answer: 207.26cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 45:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 79, 88, 13, 85, 48, 35, 74. Give your answer to 2 decimal places
Answer: Mean = 56.13, Median = 61, Range = 75