Keystones — Capstone
Five GCSE retrieval questions · 24 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √180
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 9
Answer: 5(x - 5)² - 116 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 14cm, angle = 61°. Give your answer to 2 decimal places
Answer: 91.84cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 28:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 38, 75, 55, 25, 75, 55. Give your answer to 2 decimal places
Answer: Mean = 51.29, Median = 55, Range = 50