Keystones — Capstone
Five GCSE retrieval questions · 4 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√80
Answer: 16√5 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 4
Answer: 5(x - 5)² - 129 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 12cm, angle = 69°. Give your answer to 2 decimal places
Answer: 168.04cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 3:6:2 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 70, 72, 81, 32, 23, 52. Give your answer to 2 decimal places
Answer: Mean = 51.86, Median = 52, Range = 58