Keystones — Capstone
Five GCSE retrieval questions · 15 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 4
Answer: 5(x - 4)² - 84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 14cm, angle = 58°. Give your answer to 2 decimal places
Answer: 172.15cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:20:32 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 23, 98, 19, 100, 83, 62, 45. Give your answer to 2 decimal places
Answer: Mean = 62.88, Median = 67.5, Range = 81