Keystones — Capstone
Five GCSE retrieval questions · 26 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√96
Answer: 20√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 = 30cm, b = 18cm, angle = 79°. Give your answer to 2 decimal places
Answer: 265.04cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 18:15:20 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 10, 70, 96, 55, 31, 16, 25, 92. Give your answer to 2 decimal places
Answer: Mean = 52.56, Median = 55, Range = 86