Keystones — Capstone
Five GCSE retrieval questions · 27 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√18
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 6
Answer: 3(x - 2)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 14cm, angle = 73°. Give your answer to 2 decimal places
Answer: 180.74cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 53, 56, 85, 19, 82, 45, 48, 49. Give your answer to 2 decimal places
Answer: Mean = 51.89, Median = 49, Range = 66