Keystones — Capstone
Five GCSE retrieval questions · 25 May 2012 · 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 - 4
Answer: 3(x + 4)² - 52 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 14cm, angle = 53°. Give your answer to 2 decimal places
Answer: 134.17cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 9:12:28 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 43, 14, 40, 28, 85, 99, 63, 64. Give your answer to 2 decimal places
Answer: Mean = 57.44, Median = 63, Range = 85