Keystones — Capstone
Five GCSE retrieval questions · 30 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√275
Answer: 20√11 -
2. Algebra Completing the square
Complete the square: x² + 3x - 7
Answer: (x + 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 27cm, angle = 60°. Give your answer to 2 decimal places
Answer: 280.59cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 30:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 97, 23, 51, 47, 47, 28. Give your answer to 2 decimal places
Answer: Mean = 55.86, Median = 47, Range = 75