Keystones — Capstone
Five GCSE retrieval questions · 28 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√28
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 5
Answer: 5(x + 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 13cm, angle = 80°. Give your answer to 2 decimal places
Answer: 166.43cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 35:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 89, 10, 17, 15, 34, 88, 70. Give your answer to 2 decimal places
Answer: Mean = 50.88, Median = 52, Range = 79