Keystones — Capstone
Five GCSE retrieval questions · 29 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√63
Answer: 9√7 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 15cm, angle = 73°. Give your answer to 2 decimal places
Answer: 129.cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:18:10 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 32, 85, 28, 53, 20, 67. Give your answer to 2 decimal places
Answer: Mean = 48.43, Median = 53, Range = 65