Find closest multiple of $1000$ to $1321$. We see that $1 \times 1000 = 1000$ is the nearest. Now subtract $1000$ from $1321$ to get reminder $321$. Add $1$ to quotient.
Find closest multiple of $1000$ to $3212$. We see that $3 \times 1000 = 3000$ is the nearest. Now subtract $3000$ from $3212$ to get reminder $212$. Add $3$ to quotient.
Since $212$ is less than $1000$, stop the division. The reminder is $212$. The topmost line $00013$ is the quotient. Remove all zeros at the start of the quotient to get the actual quotient $13$.