Keystones — Capstone
Five GCSE retrieval questions · 26 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 5x² + 20x + 5
Answer: 5(x + 2)² - 15 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 73°. Give your answer to 2 decimal places
Answer: 120.49cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 7:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 20, 17, 38, 97, 44, 13, 63, 53. Give your answer to 2 decimal places
Answer: Mean = 42.11, Median = 38, Range = 84