Keystones — Capstone
Five GCSE retrieval questions · 22 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 16cm, angle = 68°. Give your answer to 2 decimal places
Answer: 185.44cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 10:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 92, 40, 98, 70, 45, 100, 26, 75. Give your answer to 2 decimal places
Answer: Mean = 67.44, Median = 70, Range = 74