Keystones — Capstone
Five GCSE retrieval questions · 20 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² - 3x + 11
Answer: (x - 3⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 43°. Give your answer to 2 decimal places
Answer: 150.72cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 8:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 17, 18, 91, 88, 77, 67
Answer: Mean = 57, Median = 67, Range = 74