Keystones — Capstone
Five GCSE retrieval questions · 31 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 9
Answer: 3(x - 4)² - 57 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 26cm, angle = 57°. Give your answer to 2 decimal places
Answer: 239.86cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 6:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 97, 45, 65, 16, 29, 56, 90
Answer: Mean = 51.5, Median = 50.5, Range = 83