Keystones — Capstone
Five GCSE retrieval questions · 9 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√176
Answer: 16√11 -
2. Algebra Completing the square
Complete the square: x² + 3x - 12
Answer: (x + 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 27cm, angle = 45°. Give your answer to 2 decimal places
Answer: 190.92cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 35:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 30, 78, 81, 52, 50, 96, 82, 72. Give your answer to 2 decimal places
Answer: Mean = 64.56, Median = 72, Range = 66