Find closest multiple of $30$ to $45$. We see that $1 \times 30 = 30$ is the nearest. Now subtract $30$ from $45$ to get reminder $15$. Add $1$ to quotient.
Find closest multiple of $30$ to $156$. We see that $5 \times 30 = 150$ is the nearest. Now subtract $150$ from $156$ to get reminder $6$. Add $5$ to quotient.
Since $6$ is less than $30$, stop the division. The reminder is $6$. The topmost line $015$ is the quotient. Remove all zeros at the start of the quotient to get the actual quotient $15$.
