Keystones — Capstone
Five GCSE retrieval questions · 28 August 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: 2x² + 16x - 9
Answer: 2(x + 4)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 71°. Give your answer to 2 decimal places
Answer: 197.61cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 9:24:20 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 89, 100, 27, 22, 94, 45, 64
Answer: Mean = 60, Median = 54.5, Range = 78