Let's divide 398457 by 91
Our goal is to divide 398457 by 91.

Let's proceed to step 1:
The number 91 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 91

Moving on to step 2:
91 goes into 39 0 times with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Grab the next digit (8) from the dividend, add it to 39, then carry on: 398 / 91

On to step 3:
91 goes into 398 4 times with a remainder of 34.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 364 from 398, we get 34.
Append the next digit (4) from the dividend to 34 and continue with: 344 / 91

Advancing to step 4:
If we divide 344 by 91, we get 3 and a remainder of 71.
Use 3 as the next digit of our solution. 
Result so far: 43.0
The remainder is 71 after subtracting 273 from 344.
Include the next digit (5) from the dividend after 71, then repeat: 715 / 91

On to step 5:
If we divide 715 by 91, we get 7 and a remainder of 78.
Write down 7 as next digit of the result. 
Result so far: 437.0
Deduct 637 from 715 and we're left with 78.
Grab the next digit (7) from the dividend, add it to 78, then carry on: 787 / 91

Moving on to step 6:
The number 91 fits into 787 8 times, leaving a remainder of 59.
The next digit of our result is 8. 
Result so far: 4378.0
Subtract 728 from 787 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 7:
The number 91 fits into 590 6 times, leaving a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 4378.6
The remainder is 44 after subtracting 546 from 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 8:
The number 91 fits into 440 4 times, leaving a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 4378.64
Subtract 364 from 440 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 9:
If we divide 760 by 91, we get 8 and a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 4378.648
Deduct 728 from 760 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 10:
If we divide 320 by 91, we get 3 and a remainder of 47.
Use 3 as the next digit of our solution. 
Result so far: 4378.6483
The remainder is 47 after subtracting 273 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 11:
91 can be fit into 470 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 4378.64835
Subtract 455 from 470 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
When dividing 150 by 91, we get 1 with a remainder of 59.
Record the quotient 1 as the next digit in the result. 
Result so far: 4378.648351
Subtract 91 from 150 to get 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 13:
If we divide 590 by 91, we get 6 and a remainder of 44.
The next digit of our result is 6. 
Result so far: 4378.6483516
Subtracting 546 from 590 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 14:
The number 91 fits into 440 4 times, leaving a remainder of 76.
The next digit of our result is 4. 
Result so far: 4378.64835164
If we subtract 364 from 440, we get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

The final outcome is 4378.64835164, with a leftover of 7.6e-08.