Keystones — Capstone
Five GCSE retrieval questions · 16 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² + 3x - 6
Answer: (x + 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 42°. Give your answer to 2 decimal places
Answer: 147.88cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 62, 68, 83, 81, 77, 81. Give your answer to 2 decimal places
Answer: Mean = 72.43, Median = 77, Range = 28