Find closest multiple of $990$ to $1215$. We see that $1 \times 990 = 990$ is the nearest. Now subtract $990$ from $1215$ to get reminder $225$. Add $1$ to quotient.
Find closest multiple of $990$ to $2253$. We see that $2 \times 990 = 1980$ is the nearest. Now subtract $1980$ from $2253$ to get reminder $273$. Add $2$ to quotient.
Since $273$ is less than $990$, stop the division. The reminder is $273$. The topmost line $00012$ is the quotient. Remove all zeros at the start of the quotient to get the actual quotient $12$.