Keystones — Capstone
Five GCSE retrieval questions · 26 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: x² - 3x + 3
Answer: (x - 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 25cm, angle = 60°. Give your answer to 2 decimal places
Answer: 281.46cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 27:24:40 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 80, 30, 100, 67, 27, 46, 44, 24. Give your answer to 2 decimal places
Answer: Mean = 50.33, Median = 44, Range = 76