618661 divided by 51 
Let's see how many times 51 fits into 618661.

On to step 1:
If we divide 6 by 51, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 51

On to step 2:
When dividing 61 by 51, we get 1 with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 51 away from 61, we end up with 10.
Append the next digit (8) from the dividend to 10 and continue with: 108 / 51

On to step 3:
The number 51 fits into 108 2 times, leaving a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 102 from 108 leaves us with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 51

Let's proceed to step 4:
If we divide 66 by 51, we get 1 and a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 121.0
If we subtract 51 from 66, we get 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 51

Moving on to step 5:
51 can be fit into 156 3 times, resulting in a remainder of 3.
The next digit of our result is 3. 
Result so far: 1213.0
If we take 153 away from 156, we end up with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 51

On to step 6:
51 goes into 31 0 times with a remainder of 31.
The next digit of our result is 0. 
Result so far: 12130.0
If we take 0 away from 31, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 7:
The number 51 fits into 310 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 12130.6
Deduct 306 from 310 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 8:
40 divided by 51 is 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 12130.6
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 9:
The number 51 fits into 400 7 times, leaving a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 12130.607
If we subtract 357 from 400, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 10:
430 divided by 51 is 8 with a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 12130.6078
If we take 408 away from 430, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 11:
220 divided by 51 is 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 12130.60784
The remainder is 16 after subtracting 204 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 12:
51 can be fit into 160 3 times, resulting in a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 12130.607843
The remainder is 7 after subtracting 153 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 13:
51 can be fit into 70 1 times, resulting in a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 12130.6078431
Subtracting 51 from 70 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
51 can be fit into 190 3 times, resulting in a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 12130.60784313
If we subtract 153 from 190, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

After the division, we end up with 12130.60784313 and a remainder of 3.7e-08.