Keystones — Capstone
Five GCSE retrieval questions · 19 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 5x² - 30x - 11
Answer: 5(x - 3)² - 56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 71°. Give your answer to 2 decimal places
Answer: 159.79cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 18:30:5 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 26, 72, 90, 68, 23, 15, 95, 30. Give your answer to 2 decimal places
Answer: Mean = 56.78, Median = 68, Range = 80