Keystones — Capstone
Five GCSE retrieval questions · 16 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√48
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: x² - 5x
Answer: (x - 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 30cm, angle = 41°. Give your answer to 2 decimal places
Answer: 236.18cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 9:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 44, 94, 41, 100, 22, 35, 26, 30. Give your answer to 2 decimal places
Answer: Mean = 47.78, Median = 38, Range = 78