Keystones — Capstone
Five GCSE retrieval questions · 5 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 14
Answer: 5(x - 5)² - 139 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 20cm, angle = 80°. Give your answer to 2 decimal places
Answer: 256.05cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 48, 97, 78, 66, 43, 40, 69. Give your answer to 2 decimal places
Answer: Mean = 62.13, Median = 61, Range = 57