Keystones — Capstone
Five GCSE retrieval questions · 15 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 2
Answer: 5(x + 2)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 26cm, angle = 42°. Give your answer to 2 decimal places
Answer: 156.58cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 18:45:35 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 65, 31, 27, 47, 62, 89, 84
Answer: Mean = 55.5, Median = 54.5, Range = 62