515511 ÷ 30 
We want to divide 515511 by 30.

Moving on to step 1:
If we divide 5 by 30, we get 0 and a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 30

On to step 2:
The number 30 fits into 51 1 times, leaving a remainder of 21.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 30 from 51 leaves us with 21.
Include the next digit (5) from the dividend after 21, then repeat: 215 / 30

Advancing to step 3:
If we divide 215 by 30, we get 7 and a remainder of 5.
Use 7 as the next digit of our solution. 
Result so far: 17.0
If we take 210 away from 215, we end up with 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 30

Going ahead to step 4:
If we divide 55 by 30, we get 1 and a remainder of 25.
The next digit of our result is 1. 
Result so far: 171.0
If we subtract 30 from 55, we get 25.
Append the next digit (1) from the dividend to 25 and continue with: 251 / 30

On to step 5:
When dividing 251 by 30, we get 8 with a remainder of 11.
Record the quotient 8 as the next digit in the result. 
Result so far: 1718.0
Subtracting 240 from 251 leaves us with 11.
Fetch the next digit (1) from the dividend, attach it to 11 and continue: 111 / 30

On to step 6:
30 can be fit into 111 3 times, resulting in a remainder of 21.
The number 3 becomes the next digit in our result. 
Result so far: 17183.0
Deduct 90 from 111 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 7:
If we divide 210 by 30, we get 7 and a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 17183.7
If we subtract 210 from 210, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
When dividing 0 by 30, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 17183.7
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
If we divide 0 by 30, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 17183.7
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 17183.7, with a leftover of 0.0.