Keystones — Capstone
Five GCSE retrieval questions · 29 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 4x² - 24x + 14
Answer: 4(x - 3)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 22cm, angle = 76°. Give your answer to 2 decimal places
Answer: 298.85cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:30:54 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 93, 61, 85, 20, 53, 15, 55, 73
Answer: Mean = 61, Median = 61, Range = 79