Let's divide 400129 by 91
Our goal is to divide 400129 by 91.

Going ahead to step 1:
4 divided by 91 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 91

Step 2:
40 divided by 91 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 40, we get 40.
Take the next digit (0) from the dividend and append it to 40, then repeat: 400 / 91

Let's proceed to step 3:
400 divided by 91 is 4 with a remainder of 36.
Write down 4 as next digit of the result. 
Result so far: 4.0
Deduct 364 from 400 and we're left with 36.
Fetch the next digit (1) from the dividend, attach it to 36 and continue: 361 / 91

Advancing to step 4:
The number 91 fits into 361 3 times, leaving a remainder of 88.
Put 3 as the next digit of the answer. 
Result so far: 43.0
If we subtract 273 from 361, we get 88.
Fetch the next digit (2) from the dividend, attach it to 88 and continue: 882 / 91

Advancing to step 5:
91 goes into 882 9 times with a remainder of 63.
The next digit of our result is 9. 
Result so far: 439.0
Subtract 819 from 882 to get 63.
Grab the next digit (9) from the dividend, add it to 63, then carry on: 639 / 91

Let's proceed to step 6:
If we divide 639 by 91, we get 7 and a remainder of 2.
The next digit of our result is 7. 
Result so far: 4397.0
If we take 637 away from 639, 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.

Moving on to step 7:
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: 4397.0
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
91 goes into 200 2 times with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 4397.02
Subtracting 182 from 200 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
If we divide 180 by 91, we get 1 and a remainder of 89.
Write down 1 as next digit of the result. 
Result so far: 4397.021
Subtracting 91 from 180 leaves us 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.

Let's proceed to step 10:
If we divide 890 by 91, we get 9 and a remainder of 71.
The next digit of our result is 9. 
Result so far: 4397.0219
Subtract 819 from 890 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Let's proceed to step 11:
91 goes into 710 7 times with a remainder of 73.
Put 7 as the next digit of the answer. 
Result so far: 4397.02197
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.

Let's proceed to step 12:
The number 91 fits into 730 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 4397.021978
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.

Moving on to step 13:
The number 91 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 4397.021978
Deduct 0 from 20 and we're left 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.

Step 14:
The number 91 fits into 200 2 times, leaving a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 4397.02197802
Deduct 182 from 200 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final outcome is 4397.02197802, with a leftover of 1.8e-08.