Keystones — Capstone
Five GCSE retrieval questions · 12 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 7
Answer: 5(x + 2)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 71°. Give your answer to 2 decimal places
Answer: 258.13cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 15:10:12 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 70, 42, 47, 62, 92, 27. Give your answer to 2 decimal places
Answer: Mean = 56.57, Median = 56, Range = 65