39975 divided by 91 
Let's see how many times 91 fits into 39975.

On to step 1:
The number 91 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 91

Advancing to step 2:
91 can be fit into 39 0 times, resulting in 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.
Grab the next digit (9) from the dividend, add it to 39, then carry on: 399 / 91

Moving on to step 3:
91 can be fit into 399 4 times, resulting in a remainder of 35.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 364 from 399 and we're left with 35.
Fetch the next digit (7) from the dividend, attach it to 35 and continue: 357 / 91

Step 4:
If we divide 357 by 91, we get 3 and a remainder of 84.
Put 3 as the next digit of the answer. 
Result so far: 43.0
Subtracting 273 from 357 leaves us with 84.
Take the next digit (5) from the dividend and append it to 84, then repeat: 845 / 91

Going ahead to step 5:
When dividing 845 by 91, we get 9 with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 439.0
Subtract 819 from 845 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 6:
91 goes into 260 2 times with a remainder of 78.
The number 2 becomes the next digit in our result. 
Result so far: 439.2
Subtracting 182 from 260 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 7:
The number 91 fits into 780 8 times, leaving a remainder of 52.
The next digit of our result is 8. 
Result so far: 439.28
Deduct 728 from 780 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 8:
If we divide 520 by 91, we get 5 and a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 439.285
If we take 455 away from 520, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 9:
When dividing 650 by 91, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 439.2857
If we take 637 away from 650, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 10:
The number 91 fits into 130 1 times, leaving a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 439.28571
The remainder is 39 after subtracting 91 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 11:
91 can be fit into 390 4 times, resulting in a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 439.285714
If we subtract 364 from 390, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 12:
The number 91 fits into 260 2 times, leaving a remainder of 78.
Put 2 as the next digit of the answer. 
Result so far: 439.2857142
If we take 182 away from 260, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 13:
If we divide 780 by 91, we get 8 and a remainder of 52.
The next digit of our result is 8. 
Result so far: 439.28571428
The remainder is 52 after subtracting 728 from 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Our division results in 439.28571428 with a remaining 5.2e-08.