Keystones — Capstone
Five GCSE retrieval questions · 6 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 14
Answer: 2(x - 5)² - 36 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 15cm, angle = 45°. Give your answer to 2 decimal places
Answer: 68.94cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 83, 54, 22, 22, 74, 97. Give your answer to 2 decimal places
Answer: Mean = 60.14, Median = 69, Range = 75