Keystones — Capstone
Five GCSE retrieval questions · 12 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 4
Answer: 3(x - 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 30cm, angle = 60°. Give your answer to 2 decimal places
Answer: 233.83cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 18:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 35, 27, 74, 48, 94, 12, 12, 41. Give your answer to 2 decimal places
Answer: Mean = 43.22, Median = 41, Range = 82