Keystones — Capstone
Five GCSE retrieval questions · 7 June 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √363
Answer: 11√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 = 20cm, b = 28cm, angle = 63°. Give your answer to 2 decimal places
Answer: 249.48cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 2:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 52, 41, 47, 95, 62, 35, 86, 10. Give your answer to 2 decimal places
Answer: Mean = 57.56, Median = 52, Range = 85