Keystones — Capstone
Five GCSE retrieval questions · 10 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √567
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 10
Answer: 2(x - 5)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 24cm, angle = 51°. Give your answer to 2 decimal places
Answer: 261.12cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 24:28:63 -
5. Statistics Averages and range
Find the mean, median and range of: 99, 46, 40, 95, 99, 96, 88, 10, 17. Give your answer to 2 decimal places
Answer: Mean = 65.56, Median = 88, Range = 89