Keystones — Capstone
Five GCSE retrieval questions · 16 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 5x² - 50x - 8
Answer: 5(x - 5)² - 133 -
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 3:7 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 27:63:35 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 49, 14, 71, 55, 84, 68, 16, 87. Give your answer to 2 decimal places
Answer: Mean = 52.22, Median = 55, Range = 73