Keystones — Capstone
Five GCSE retrieval questions · 24 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√150
Answer: 25√6 -
2. Algebra Completing the square
Complete the square: x² + x - 4
Answer: (x + 1⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 15cm, angle = 54°. Give your answer to 2 decimal places
Answer: 91.01cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 8:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 48, 53, 14, 24, 64, 97, 97. Give your answer to 2 decimal places
Answer: Mean = 57.63, Median = 58.5, Range = 83