Math Problem Solver

\[ \frac{5}{2} - \frac{9}{8} = \frac{11}{8} = 1.375 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{5}{2}\) and \(\frac{-9}{8}\) is \(8\). \[ \begin{aligned} \frac{5}{2} - \frac{9}{8} &= \frac{5 \cdot 4}{2 \cdot 4} + \frac{-9 \cdot 1}{8 \cdot 1} \\ &= \frac{20 + -9}{8} \\ &= \frac{11}{8} \end{aligned} \]