We divide 398560 by 91
We want to figure out the number of times 398560 can be divided by 91.

Moving on to step 1:
When dividing 3 by 91, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 91

Step 2:
The number 91 fits into 39 0 times, leaving a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Fetch the next digit (8) from the dividend, attach it to 39 and continue: 398 / 91

On to step 3:
The number 91 fits into 398 4 times, leaving a remainder of 34.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 364 away from 398, we end up with 34.
Grab the next digit (5) from the dividend, add it to 34, then carry on: 345 / 91

Going ahead to step 4:
91 can be fit into 345 3 times, resulting in a remainder of 72.
The next digit of our result is 3. 
Result so far: 43.0
Subtract 273 from 345 to get 72.
Fetch the next digit (6) from the dividend, attach it to 72 and continue: 726 / 91

Advancing to step 5:
When dividing 726 by 91, we get 7 with a remainder of 89.
Use 7 as the next digit of our solution. 
Result so far: 437.0
Deduct 637 from 726 and we're left with 89.
Fetch the next digit (0) from the dividend, attach it to 89 and continue: 890 / 91

Advancing to step 6:
91 can be fit into 890 9 times, resulting in a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 4379.0
Deduct 819 from 890 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 7:
If we divide 710 by 91, we get 7 and a remainder of 73.
Put 7 as the next digit of the answer. 
Result so far: 4379.7
If we take 637 away from 710, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Going ahead to step 8:
If we divide 730 by 91, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 4379.78
Subtract 728 from 730 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.

Step 9:
The number 91 fits into 20 0 times, leaving a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 4379.78
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
91 goes into 200 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 4379.7802
Subtract 182 from 200 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 11:
When dividing 180 by 91, we get 1 with a remainder of 89.
The next digit of our result is 1. 
Result so far: 4379.78021
If we take 91 away from 180, we end up with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

On to step 12:
91 can be fit into 890 9 times, resulting in a remainder of 71.
The next digit of our result is 9. 
Result so far: 4379.780219
Deduct 819 from 890 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 13:
When dividing 710 by 91, we get 7 with a remainder of 73.
Write down 7 as next digit of the result. 
Result so far: 4379.7802197
Subtracting 637 from 710 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 14:
When dividing 730 by 91, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 4379.78021978
If we take 728 away from 730, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 4379.78021978 with a remaining 2e-09.