Keystones — Capstone
Five GCSE retrieval questions · 16 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² - x + 1
Answer: (x - 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 44°. Give your answer to 2 decimal places
Answer: 127.82cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 81:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 88, 100, 18, 59, 86, 61, 44, 77. Give your answer to 2 decimal places
Answer: Mean = 61.89, Median = 61, Range = 82