Keystones — Capstone
Five GCSE retrieval questions · 8 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 9
Answer: 3(x + 5)² - 84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 18cm, angle = 68°. Give your answer to 2 decimal places
Answer: 183.58cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 8:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 97, 38, 46, 64, 27, 17, 38. Give your answer to 2 decimal places
Answer: Mean = 49.63, Median = 42, Range = 80