Keystones — Capstone
Five GCSE retrieval questions · 25 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 3
Answer: 3(x - 2)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 57°. Give your answer to 2 decimal places
Answer: 150.96cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 6:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 33, 66, 32, 32, 50, 40, 72
Answer: Mean = 45.5, Median = 39.5, Range = 40