Math Problem Solver

\[ 3 - \frac{1}{2} = \frac{5}{2} = 2.5 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{3}{1}\) and \(\frac{-1}{2}\) is \(2\). \[ \begin{aligned} 3 - \frac{1}{2} &= \frac{3 \cdot 2}{1 \cdot 2} + \frac{-1 \cdot 1}{2 \cdot 1} \\ &= \frac{6 + -1}{2} \\ &= \frac{5}{2} \end{aligned} \]