Keystones — Capstone
Five GCSE retrieval questions · 23 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√50
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: 3x² - 12x - 5
Answer: 3(x - 2)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 20cm, angle = 59°. Give your answer to 2 decimal places
Answer: 162.86cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 14:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 99, 69, 48, 91, 40, 25. Give your answer to 2 decimal places
Answer: Mean = 60.29, Median = 50, Range = 74