Keystones — Capstone
Five GCSE retrieval questions · 26 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√27
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² + 5x + 6
Answer: (x + 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 44°. Give your answer to 2 decimal places
Answer: 100.03cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 3:12:16 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 25, 73, 57, 40, 59, 35, 30. Give your answer to 2 decimal places
Answer: Mean = 51.13, Median = 48.5, Range = 65