Keystones — Capstone
Five GCSE retrieval questions · 28 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 3
Answer: 4(x + 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 18cm, angle = 79°. Give your answer to 2 decimal places
Answer: 203.2cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 72:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 96, 49, 90, 92, 81, 49. Give your answer to 2 decimal places
Answer: Mean = 73.71, Median = 81, Range = 47