Keystones — Capstone
Five GCSE retrieval questions · 30 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 12
Answer: 5(x - 5)² - 137 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 24cm, angle = 70°. Give your answer to 2 decimal places
Answer: 180.42cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 53, 80, 12, 90, 64, 75, 100, 20. Give your answer to 2 decimal places
Answer: Mean = 62.67, Median = 70, Range = 88