Keystones — Capstone
Five GCSE retrieval questions · 17 March 2013 · 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 + 20x + 5
Answer: 2(x + 5)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 24cm, angle = 60°. Give your answer to 2 decimal places
Answer: 218.24cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 64:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 67, 15, 51, 79, 18, 70, 87, 24. Give your answer to 2 decimal places
Answer: Mean = 51.38, Median = 59, Range = 72