We divide 398457 by 81
We want to divide 398457 by 81.

Let's proceed to step 1:
If we divide 3 by 81, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 81

Moving on to step 2:
39 divided by 81 is 0 with a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Append the next digit (8) from the dividend to 39 and continue with: 398 / 81

Moving on to step 3:
81 goes into 398 4 times with a remainder of 74.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 324 from 398, we get 74.
Grab the next digit (4) from the dividend, add it to 74, then carry on: 744 / 81

Moving on to step 4:
81 goes into 744 9 times with a remainder of 15.
Write down 9 as next digit of the result. 
Result so far: 49.0
The remainder is 15 after subtracting 729 from 744.
Grab the next digit (5) from the dividend, add it to 15, then carry on: 155 / 81

Step 5:
When dividing 155 by 81, we get 1 with a remainder of 74.
Put 1 as the next digit of the answer. 
Result so far: 491.0
If we subtract 81 from 155, we get 74.
Grab the next digit (7) from the dividend, add it to 74, then carry on: 747 / 81

Advancing to step 6:
747 divided by 81 is 9 with a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 4919.0
Deduct 729 from 747 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.

Advancing to step 7:
If we divide 180 by 81, we get 2 and a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 4919.2
If we subtract 162 from 180, we 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.

Moving on to step 8:
The number 81 fits into 180 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 4919.22
The remainder is 18 after subtracting 162 from 180.
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 4919.22, with a leftover of 0.018.