Step 1 :\(10.4\text{ quarts to }8.0\text{ quarts}=\frac{10.4}{8.0}\)
Step 2 :\(\frac{10.4}{8.0}=10.4\div8.0=10.4\cdot\frac{1}{8.0}\)
Step 3 :\(10.4\cdot\frac{1}{8.0}=\boxed{1.3}\)