Keystones — Capstone
Five GCSE retrieval questions · 5 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√112
Answer: 16√7 -
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 = 23cm, b = 27cm, angle = 60°. Give your answer to 2 decimal places
Answer: 268.9cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 20, 98, 21, 25, 11, 87, 75, 76
Answer: Mean = 48, Median = 25, Range = 87