Keystones — Capstone
Five GCSE retrieval questions · 27 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: 5x² - 10x + 8
Answer: 5(x - 1)² + 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 24cm, angle = 72°. Give your answer to 2 decimal places
Answer: 136.95cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:42:54 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 55, 29, 70, 19, 37, 38, 69
Answer: Mean = 41.5, Median = 37.5, Range = 55