Keystones — Capstone
Five GCSE retrieval questions · 14 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: x² - 9x - 4
Answer: (x - 9⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 66°. Give your answer to 2 decimal places
Answer: 219.25cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 83, 37, 19, 82, 73, 24, 46, 77. Give your answer to 2 decimal places
Answer: Mean = 54.67, Median = 51, Range = 64