Keystones — Capstone
Five GCSE retrieval questions · 5 September 2012 · 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 - 3x - 8
Answer: (x - 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 15cm, angle = 60°. Give your answer to 2 decimal places
Answer: 123.41cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 6:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 77, 24, 53, 57, 31, 64, 21, 25. Give your answer to 2 decimal places
Answer: Mean = 42.89, Median = 34, Range = 56