Keystones — Capstone
Five GCSE retrieval questions · 5 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 6
Answer: 5(x - 3)² - 51 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 63°. Give your answer to 2 decimal places
Answer: 178.2cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 45:36:16 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 68, 16, 33, 36, 14, 15, 93, 55. Give your answer to 2 decimal places
Answer: Mean = 41.22, Median = 36, Range = 79