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Which is smaller?
 
The difference between \(2\frac{1}{2}\) and \(3\frac{2}{3}\) or the sum of \(1\frac{1}{2}\) and \(2\frac{1}{4}\).
 
\(3\frac{2}{3} - 2\frac{1}{2}\) \(1\frac{1}{2} + 2\frac{1}{4}\).