Keystones — Capstone
Five GCSE retrieval questions · 6 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 4x² + 16x + 7
Answer: 4(x + 2)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 41°. Give your answer to 2 decimal places
Answer: 147.61cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 12:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 51, 100, 41, 19, 69, 86, 18, 80. Give your answer to 2 decimal places
Answer: Mean = 62.33, Median = 69, Range = 82