We look at the division of 53949643 by 398 
Let's see how many times 398 fits into 53949643.

Let's proceed to step 1:
398 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 398

Going ahead to step 2:
398 can be fit into 53 0 times, resulting in a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 53 to get 53.
Bring next digit (9) of the dividend behind the 53 and repeat the process: 539 / 398

Step 3:
When dividing 539 by 398, we get 1 with a remainder of 141.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 398 from 539, we get 141.
Grab the next digit (4) from the dividend, add it to 141, then carry on: 1414 / 398

Let's proceed to step 4:
398 goes into 1414 3 times with a remainder of 220.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
The remainder is 220 after subtracting 1194 from 1414.
Append the next digit (9) from the dividend to 220 and continue with: 2209 / 398

Moving on to step 5:
398 can be fit into 2209 5 times, resulting in a remainder of 219.
Put 5 as the next digit of the answer. 
Result so far: 135.0
Deduct 1990 from 2209 and we're left with 219.
Fetch the next digit (6) from the dividend, attach it to 219 and continue: 2196 / 398

Moving on to step 6:
2196 divided by 398 is 5 with a remainder of 206.
The next digit of our result is 5. 
Result so far: 1355.0
If we take 1990 away from 2196, we end up with 206.
Bring next digit (4) of the dividend behind the 206 and repeat the process: 2064 / 398

Step 7:
398 goes into 2064 5 times with a remainder of 74.
Record the quotient 5 as the next digit in the result. 
Result so far: 13555.0
If we subtract 1990 from 2064, we get 74.
Append the next digit (3) from the dividend to 74 and continue with: 743 / 398

Let's proceed to step 8:
When dividing 743 by 398, we get 1 with a remainder of 345.
Write down 1 as next digit of the result. 
Result so far: 135551.0
Subtract 398 from 743 to get 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Advancing to step 9:
When dividing 3450 by 398, we get 8 with a remainder of 266.
The next digit of our result is 8. 
Result so far: 135551.8
Subtracting 3184 from 3450 leaves us with 266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2660, and continue the process.

Going ahead to step 10:
398 can be fit into 2660 6 times, resulting in a remainder of 272.
Record the quotient 6 as the next digit in the result. 
Result so far: 135551.86
Subtract 2388 from 2660 to get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

On to step 11:
When dividing 2720 by 398, we get 6 with a remainder of 332.
The number 6 becomes the next digit in our result. 
Result so far: 135551.866
The remainder is 332 after subtracting 2388 from 2720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

The final outcome is 135551.866, with a leftover of 0.0332.