Keystones — Capstone
Five GCSE retrieval questions · 27 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√275
Answer: 25√11 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 5
Answer: 4(x + 5)² - 95 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 14cm, angle = 59°. Give your answer to 2 decimal places
Answer: 108cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 49:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 71, 72, 13, 79, 38, 23
Answer: Mean = 46, Median = 38, Range = 66