Keystones — Capstone
Five GCSE retrieval questions · 22 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 8
Answer: 5(x - 2)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 26cm, angle = 61°. Give your answer to 2 decimal places
Answer: 181.92cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 32:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 40, 14, 24, 28, 35, 71. Give your answer to 2 decimal places
Answer: Mean = 34.29, Median = 28, Range = 57