Keystones — Capstone
Five GCSE retrieval questions · 17 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 6
Answer: 5(x - 2)² - 26 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 67°. Give your answer to 2 decimal places
Answer: 276.15cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 63:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 73, 100, 19, 97, 20, 45, 20, 43. Give your answer to 2 decimal places
Answer: Mean = 54.78, Median = 45, Range = 81