1. **State the problem:** Write the fractions $\frac{3}{9}$, $\frac{1}{7}$, and $\frac{5}{8}$ in order from least to greatest. 2. **Formula and rules:** To compare fractions, convert them to decimals or find a common denominator. 3. **Convert each fraction to decimal:** - $\frac{3}{9} = \frac{1}{3} \approx 0.333$ - $\frac{1}{7} \approx 0.1429$ - $\frac{5}{8} = 0.625$ 4. **Order the decimals:** $0.1429 < 0.333 < 0.625$ 5. **Write the fractions in order:** $$\frac{1}{7} < \frac{3}{9} < \frac{5}{8}$$ **Final answer:** $\frac{1}{7}$, $\frac{3}{9}$, $\frac{5}{8}$