Keystones — Capstone
Five GCSE retrieval questions · 12 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√75
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 3
Answer: 5(x + 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 193.02cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 20:45:18 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 81, 74, 20, 25, 30, 12, 96, 54. Give your answer to 2 decimal places
Answer: Mean = 49.78, Median = 54, Range = 84