Math Problem Solver

\[ \frac{3}{12} - \frac{3}{15} = \frac{1}{20} = 0.05 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{3}{12}\) and \(\frac{-3}{15}\) is \(60\). \[ \begin{aligned} \frac{3}{12} - \frac{3}{15} &= \frac{3 \cdot 5}{12 \cdot 5} + \frac{-3 \cdot 4}{15 \cdot 4} \\ &= \frac{15 + -12}{60} \\ &= \frac{3}{60} \\&= \frac{1}{20} \end{aligned} \]