Keystones — Capstone
Five GCSE retrieval questions · 21 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 3x + 9
Answer: (x + 3⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 105.16cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 5:35:49 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 16, 12, 41, 10, 88, 21. Give your answer to 2 decimal places
Answer: Mean = 31.29, Median = 21, Range = 78