Keystones — Capstone
Five GCSE retrieval questions · 16 April 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 + 8
Answer: (x - 1⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 25cm, angle = 74°. Give your answer to 2 decimal places
Answer: 324.43cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 30, 37, 43, 73, 78, 96, 68
Answer: Mean = 58.25, Median = 55.5, Range = 66