Keystones — Capstone
Five GCSE retrieval questions · 11 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 4
Answer: 5(x + 3)² - 49 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 53°. Give your answer to 2 decimal places
Answer: 167.71cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 78, 92, 37, 65, 46, 33, 70, 30. Give your answer to 2 decimal places
Answer: Mean = 55.22, Median = 46, Range = 62