Keystones — Capstone
Five GCSE retrieval questions · 6 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 5x² + 50x - 1
Answer: 5(x + 5)² - 126 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 15cm, angle = 69°. Give your answer to 2 decimal places
Answer: 203.05cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 6:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 22, 37, 13, 78, 24, 54, 20. Give your answer to 2 decimal places
Answer: Mean = 33.63, Median = 23, Range = 65