Keystones — Capstone
Five GCSE retrieval questions · 23 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√125
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 2
Answer: 5(x - 4)² - 82 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 18cm, angle = 58°. Give your answer to 2 decimal places
Answer: 198.44cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 24:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 87, 76, 62, 54, 74, 36, 97. Give your answer to 2 decimal places
Answer: Mean = 67.88, Median = 68, Range = 61