Keystones — Capstone
Five GCSE retrieval questions · 13 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 5x² + 50x - 2
Answer: 5(x + 5)² - 127 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 27cm, angle = 40°. Give your answer to 2 decimal places
Answer: 147.52cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 28:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 20, 90, 95, 35, 16, 75, 95. Give your answer to 2 decimal places
Answer: Mean = 57.38, Median = 55, Range = 79