Keystones — Capstone
Five GCSE retrieval questions · 18 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 6
Answer: 3(x + 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 51°. Give your answer to 2 decimal places
Answer: 136cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 72, 73, 16, 66, 43, 80, 17
Answer: Mean = 50.75, Median = 54.5, Range = 64