We divide 42398 by 80
We want to divide 42398 by 80.

Advancing to step 1:
4 divided by 80 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 80

Step 2:
80 can be fit into 42 0 times, resulting in a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 42 to get 42.
Fetch the next digit (3) from the dividend, attach it to 42 and continue: 423 / 80

Going ahead to step 3:
If we divide 423 by 80, we get 5 and a remainder of 23.
Put 5 as the next digit of the answer. 
Result so far: 5.0
The remainder is 23 after subtracting 400 from 423.
Fetch the next digit (9) from the dividend, attach it to 23 and continue: 239 / 80

Step 4:
80 can be fit into 239 2 times, resulting in a remainder of 79.
Record the quotient 2 as the next digit in the result. 
Result so far: 52.0
The remainder is 79 after subtracting 160 from 239.
Include the next digit (8) from the dividend after 79, then repeat: 798 / 80

Moving on to step 5:
The number 80 fits into 798 9 times, leaving a remainder of 78.
Put 9 as the next digit of the answer. 
Result so far: 529.0
The remainder is 78 after subtracting 720 from 798.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

On to step 6:
The number 80 fits into 780 9 times, leaving a remainder of 60.
The number 9 becomes the next digit in our result. 
Result so far: 529.9
If we subtract 720 from 780, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 7:
When dividing 600 by 80, we get 7 with a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 529.97
Subtract 560 from 600 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 8:
400 divided by 80 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 529.975
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 529.975
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 529.975
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 529.975 with a remainder of 0.0.