Keystones — Capstone
Five GCSE retrieval questions · 4 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√160
Answer: 16√10 -
2. Algebra Completing the square
Complete the square: x² + 5x - 12
Answer: (x + 5⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 17cm, angle = 45°. Give your answer to 2 decimal places
Answer: 90.16cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 3:12:28 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 37, 92, 86, 26, 73, 92, 51
Answer: Mean = 69.25, Median = 79.5, Range = 71