Keystones — Capstone
Five GCSE retrieval questions · 11 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 3x² + 12x - 8
Answer: 3(x + 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 23cm, angle = 80°. Give your answer to 2 decimal places
Answer: 203.86cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 18:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 100, 16, 65, 41, 28, 42, 42. Give your answer to 2 decimal places
Answer: Mean = 44.88, Median = 41.5, Range = 84