Find closest multiple of $4200$ to $8000$. We see that $1 \times 4200 = 4200$ is the nearest. Now subtract $4200$ from $8000$ to get reminder $3800$. Add $1$ to quotient.
Find closest multiple of $4200$ to $38000$. We see that $9 \times 4200 = 37800$ is the nearest. Now subtract $37800$ from $38000$ to get reminder $200$. Add $9$ to quotient.
Since $200$ is less than $4200$, stop the division. The reminder is $200$. The topmost line $00019$ is the quotient. Remove all zeros at the start of the quotient to get the actual quotient $19$.
