Keystones — Capstone
Five GCSE retrieval questions · 26 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² + 9x - 5
Answer: (x + 9⁄2)² - 101⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 19cm, angle = 44°. Give your answer to 2 decimal places
Answer: 151.78cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 56:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 49, 77, 82, 61, 37, 47, 98, 45. Give your answer to 2 decimal places
Answer: Mean = 65.44, Median = 61, Range = 61