15611 ÷ 51 
We want to figure out the number of times 15611 can be divided by 51.

On to step 1:
51 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 51

Moving on to step 2:
51 goes into 15 0 times with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 15 after subtracting 0 from 15.
Take the next digit (6) from the dividend and append it to 15, then repeat: 156 / 51

Going ahead to step 3:
The number 51 fits into 156 3 times, leaving a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 153 from 156 and we're left with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 51

Advancing to step 4:
If we divide 31 by 51, we get 0 and a remainder of 31.
Use 0 as the next digit of our solution. 
Result so far: 30.0
If we subtract 0 from 31, we get 31.
Append the next digit (1) from the dividend to 31 and continue with: 311 / 51

Going ahead to step 5:
When dividing 311 by 51, we get 6 with a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 306.0
If we subtract 306 from 311, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 6:
If we divide 50 by 51, we get 0 and a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 306.0
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 7:
The number 51 fits into 500 9 times, leaving a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 306.09
Subtract 459 from 500 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Step 8:
When dividing 410 by 51, we get 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 306.098
Subtract 408 from 410 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 9:
When dividing 20 by 51, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 306.098
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
If we divide 200 by 51, we get 3 and a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 306.09803
Subtracting 153 from 200 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 11:
When dividing 470 by 51, we get 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 306.098039
If we subtract 459 from 470, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 12:
The number 51 fits into 110 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 306.0980392
If we take 102 away from 110, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 13:
If we divide 80 by 51, we get 1 and a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 306.09803921
Subtract 51 from 80 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Our division results in 306.09803921 with a remaining 2.9e-08.