Keystones — Capstone
Five GCSE retrieval questions · 18 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√112
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 67°. Give your answer to 2 decimal places
Answer: 158.79cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 14:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 10, 96, 82, 84, 47, 99. Give your answer to 2 decimal places
Answer: Mean = 63.57, Median = 82, Range = 89