Keystones — Capstone
Five GCSE retrieval questions · 1 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 5x² - 10x - 10
Answer: 5(x - 1)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 77°. Give your answer to 2 decimal places
Answer: 266cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:20:28 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 99, 87, 54, 81, 43, 35, 100
Answer: Mean = 72.75, Median = 82, Range = 65