To find out how many students were on each bus, we first need to determine how many students traveled by bus.
If there were 449 students in total and 8 students traveled by car, then the number of students who rode the buses is:
\[ 449 - 8 = 441 \]
Next, we know that there were 9 buses filled with students. To find out how many students were on each bus, we divide the total number of students who traveled by bus by the number of buses:
\[ \text{Number of students on each bus} = \frac{441}{9} \]
Calculating this gives us:
\[ \frac{441}{9} = 49 \]
Therefore, each bus had 49 students on it.