1. The problem is to express 0.003 as a common fraction. 2. Recall that a decimal can be written as a fraction with a denominator that is a power of 10. Here, 0.003 means 3 thousandths. 3. Write 0.003 as \( \frac{3}{1000} \). 4. Check if the fraction can be simplified by finding the greatest common divisor (GCD) of 3 and 1000. 5. Since 3 and 1000 have no common factors other than 1, the fraction \( \frac{3}{1000} \) is already in simplest form. 6. Therefore, the common fraction of 0.003 is \( \frac{3}{1000} \).