Keystones — Capstone
Five GCSE retrieval questions · 4 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √176
Answer: 4√11 -
2. Algebra Completing the square
Complete the square: x² - x + 1
Answer: (x - 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 15cm, angle = 58°. Give your answer to 2 decimal places
Answer: 76.32cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:36:81 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 29, 29, 90, 53, 65, 64, 42, 82. Give your answer to 2 decimal places
Answer: Mean = 54.89, Median = 53, Range = 61