Keystones — Capstone
Five GCSE retrieval questions · 25 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 9x - 9
Answer: (x + 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 25cm, angle = 66°. Give your answer to 2 decimal places
Answer: 171.29cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 55, 71, 42, 59, 51, 69, 69, 65. Give your answer to 2 decimal places
Answer: Mean = 58.22, Median = 59, Range = 29