We look at the division of 399610 by 91 
Our goal is to divide 399610 by 91.

Advancing to step 1:
91 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 91

Let's proceed to step 2:
39 divided by 91 is 0 with a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Include the next digit (9) from the dividend after 39, then repeat: 399 / 91

Step 3:
When dividing 399 by 91, we get 4 with a remainder of 35.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 364 from 399 and we're left with 35.
Include the next digit (6) from the dividend after 35, then repeat: 356 / 91

Advancing to step 4:
The number 91 fits into 356 3 times, leaving a remainder of 83.
Use 3 as the next digit of our solution. 
Result so far: 43.0
The remainder is 83 after subtracting 273 from 356.
Bring next digit (1) of the dividend behind the 83 and repeat the process: 831 / 91

Going ahead to step 5:
831 divided by 91 is 9 with a remainder of 12.
Write down 9 as next digit of the result. 
Result so far: 439.0
If we subtract 819 from 831, we get 12.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 91

On to step 6:
120 divided by 91 is 1 with a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 4391.0
The remainder is 29 after subtracting 91 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 7:
91 goes into 290 3 times with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 4391.3
If we subtract 273 from 290, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 8:
91 can be fit into 170 1 times, resulting in a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 4391.31
If we subtract 91 from 170, we get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Step 9:
91 can be fit into 790 8 times, resulting in a remainder of 62.
Put 8 as the next digit of the answer. 
Result so far: 4391.318
Subtract 728 from 790 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 10:
620 divided by 91 is 6 with a remainder of 74.
Use 6 as the next digit of our solution. 
Result so far: 4391.3186
Subtracting 546 from 620 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 11:
The number 91 fits into 740 8 times, leaving a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 4391.31868
The remainder is 12 after subtracting 728 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 12:
The number 91 fits into 120 1 times, leaving a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 4391.318681
If we subtract 91 from 120, we 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.

Let's proceed to step 13:
91 can be fit into 290 3 times, resulting in a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 4391.3186813
The remainder is 17 after subtracting 273 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 14:
170 divided by 91 is 1 with a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 4391.31868131
Subtracting 91 from 170 leaves us with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

After the division, we end up with 4391.31868131 and a remainder of 7.9e-08.