We're dividing 961881 by 51 
We're looking to find how many times 51 goes into 961881.

Step 1:
When dividing 9 by 51, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 51

Let's proceed to step 2:
The number 51 fits into 96 1 times, leaving a remainder of 45.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 51 away from 96, we end up with 45.
Include the next digit (1) from the dividend after 45, then repeat: 451 / 51

Going ahead to step 3:
If we divide 451 by 51, we get 8 and a remainder of 43.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
The remainder is 43 after subtracting 408 from 451.
Fetch the next digit (8) from the dividend, attach it to 43 and continue: 438 / 51

Step 4:
If we divide 438 by 51, we get 8 and a remainder of 30.
Use 8 as the next digit of our solution. 
Result so far: 188.0
If we take 408 away from 438, we end up with 30.
Bring next digit (8) of the dividend behind the 30 and repeat the process: 308 / 51

Step 5:
When dividing 308 by 51, we get 6 with a remainder of 2.
The next digit of our result is 6. 
Result so far: 1886.0
Deduct 306 from 308 and we're left with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 51

On to step 6:
When dividing 21 by 51, we get 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 18860.0
Subtracting 0 from 21 leaves us 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.

Let's proceed to step 7:
51 goes into 210 4 times with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 18860.4
If we take 204 away from 210, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
If we divide 60 by 51, we get 1 and a remainder of 9.
The next digit of our result is 1. 
Result so far: 18860.41
Subtract 51 from 60 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 9:
When dividing 90 by 51, we get 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 18860.411
The remainder is 39 after subtracting 51 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final result is 18860.411 with a remainder of 0.0039.