Keystones — Capstone
Five GCSE retrieval questions · 30 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
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 = 23cm, b = 27cm, angle = 57°. Give your answer to 2 decimal places
Answer: 260.41cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 8:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 31, 96, 95, 15, 91, 27, 44, 73. Give your answer to 2 decimal places
Answer: Mean = 56.11, Median = 44, Range = 81