Find closest multiple of $12$ to $12$. We see that $1 \times 12 = 12$ is the nearest. Now subtract $12$ from $12$ to get reminder $0$. Add $1$ to quotient.
Find closest multiple of $12$ to $36$. We see that $3 \times 12 = 36$ is the nearest. Now subtract $36$ from $36$ to get reminder $0$. Add $3$ to quotient.
Since $0$ is less than $12$, stop the division. The reminder is $0$. The topmost line $0103$ is the quotient. Remove all zeros at the start of the quotient to get the actual quotient $103$.