Keystones — Capstone
Five GCSE retrieval questions · 12 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² + 3x - 5
Answer: (x + 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 43°. Give your answer to 2 decimal places
Answer: 119.35cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 45:72:56 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 16, 83, 77, 21, 100, 87, 61, 10. Give your answer to 2 decimal places
Answer: Mean = 61.11, Median = 77, Range = 90