Keystones — Capstone
Five GCSE retrieval questions · 7 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² + 9x + 12
Answer: (x + 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 15cm, angle = 63°. Give your answer to 2 decimal places
Answer: 133.65cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 27:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 67, 38, 78, 92, 62, 96. Give your answer to 2 decimal places
Answer: Mean = 68.43, Median = 67, Range = 58