Keystones — Capstone
Five GCSE retrieval questions · 24 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√150
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: 4x² + 32x
Answer: 4(x + 4)² - 64 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 21cm, angle = 60°. Give your answer to 2 decimal places
Answer: 236.42cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 75, 69, 45, 61, 99, 98, 75, 42. Give your answer to 2 decimal places
Answer: Mean = 69.56, Median = 69, Range = 57