Keystones — Capstone
Five GCSE retrieval questions · 28 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 12
Answer: 4(x + 6)² - 132 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 23cm, angle = 71°. Give your answer to 2 decimal places
Answer: 304.46cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 21:15:40 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 77, 17, 78, 66, 45, 51, 35
Answer: Mean = 56.25, Median = 58.5, Range = 64