Keystones — Capstone
Five GCSE retrieval questions · 18 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 4
Answer: 3(x + 5)² - 71 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 69°. Give your answer to 2 decimal places
Answer: 184.85cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 53, 65, 82, 20, 66, 81. Give your answer to 2 decimal places
Answer: Mean = 53.86, Median = 65, Range = 72