Find closest multiple of $21$ to $42$. We see that $2 \times 21 = 42$ is the nearest. Now subtract $42$ from $42$ to get reminder $0$. Add $2$ to quotient.
Find closest multiple of $21$ to $42$. We see that $2 \times 21 = 42$ is the nearest. Now subtract $42$ from $42$ to get reminder $0$. Add $2$ to quotient.
Since $0$ is less than $21$, stop the division. The reminder is $0$. The topmost line $0202$ is the quotient. Remove all zeros at the start of the quotient to get the actual quotient $202$.