Keystones — Capstone
Five GCSE retrieval questions · 15 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 4x² - 48x + 6
Answer: 4(x - 6)² - 138 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 25cm, angle = 53°. Give your answer to 2 decimal places
Answer: 219.62cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 25:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 12, 68, 71, 28, 80, 58
Answer: Mean = 59, Median = 68, Range = 84