Find closest multiple of $75$ to $630$. We see that $8 \times 75 = 600$ is the nearest. Now subtract $600$ from $630$ to get reminder $30$. Add $8$ to quotient.
Find closest multiple of $75$ to $303$. We see that $4 \times 75 = 300$ is the nearest. Now subtract $300$ from $303$ to get reminder $3$. Add $4$ to quotient.
Since $3$ is less than $75$, stop the division. The reminder is $3$. The topmost line $0084$ is the quotient. Remove all zeros at the start of the quotient to get the actual quotient $84$.