Keystones — Capstone
Five GCSE retrieval questions · 23 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 1
Answer: 4(x + 5)² - 101 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 46°. Give your answer to 2 decimal places
Answer: 173.72cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 14:63:36 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 16, 24, 38, 82, 97, 56, 70, 63. Give your answer to 2 decimal places
Answer: Mean = 56.67, Median = 63, Range = 81