Keystones — Capstone
Five GCSE retrieval questions · 19 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: x² - x + 12
Answer: (x - 1⁄2)² + 47⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 143.76cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 95, 90, 92, 22, 38, 46. Give your answer to 2 decimal places
Answer: Mean = 56.29, Median = 46, Range = 84