Keystones — Capstone
Five GCSE retrieval questions · 2 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 13
Answer: 4(x + 5)² - 113 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 50°. Give your answer to 2 decimal places
Answer: 248.2cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 72:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 91, 21, 34, 26, 28, 25. Give your answer to 2 decimal places
Answer: Mean = 35.29, Median = 26, Range = 70