Keystones — Capstone
Five GCSE retrieval questions · 3 May 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√150
Answer: 15√6 -
2. Algebra Completing the square
Complete the square: x² + x + 5
Answer: (x + 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 20cm, angle = 42°. Give your answer to 2 decimal places
Answer: 167.28cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 47, 14, 91, 45, 90, 40, 95, 47. Give your answer to 2 decimal places
Answer: Mean = 53.78, Median = 47, Range = 81