Keystones — Capstone
Five GCSE retrieval questions · 1 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√8
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 1
Answer: 3(x + 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 20cm, angle = 69°. Give your answer to 2 decimal places
Answer: 186.72cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 10:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 71, 32, 56, 87, 73, 90, 43, 27, 17. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 56, Range = 73