Keystones — Capstone
Five GCSE retrieval questions · 16 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 11
Answer: 3(x + 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 55°. Give your answer to 2 decimal places
Answer: 216.26cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 27:24:4 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 85, 71, 50, 67, 17, 85, 64
Answer: Mean = 59.5, Median = 65.5, Range = 68