We're dividing 123139 by 80 
Let's see how many times 80 fits into 123139.

Going ahead to step 1:
1 divided by 80 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 80

Step 2:
If we divide 12 by 80, we get 0 and a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (3) from the dividend, add it to 12, then carry on: 123 / 80

Going ahead to step 3:
If we divide 123 by 80, we get 1 and a remainder of 43.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 80 from 123 and we're left with 43.
Fetch the next digit (1) from the dividend, attach it to 43 and continue: 431 / 80

Advancing to step 4:
The number 80 fits into 431 5 times, leaving a remainder of 31.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtract 400 from 431 to get 31.
Bring next digit (3) of the dividend behind the 31 and repeat the process: 313 / 80

Let's proceed to step 5:
313 divided by 80 is 3 with a remainder of 73.
Put 3 as the next digit of the answer. 
Result so far: 153.0
The remainder is 73 after subtracting 240 from 313.
Include the next digit (9) from the dividend after 73, then repeat: 739 / 80

Going ahead to step 6:
80 goes into 739 9 times with a remainder of 19.
Record the quotient 9 as the next digit in the result. 
Result so far: 1539.0
If we take 720 away from 739, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 7:
When dividing 190 by 80, we get 2 with a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 1539.2
If we take 160 away from 190, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
When dividing 300 by 80, we get 3 with a remainder of 60.
Write down 3 as next digit of the result. 
Result so far: 1539.23
Subtracting 240 from 300 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 9:
600 divided by 80 is 7 with a remainder of 40.
The number 7 becomes the next digit in our result. 
Result so far: 1539.237
The remainder is 40 after subtracting 560 from 600.
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 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 1539.2375
Subtract 400 from 400 to get 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 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1539.2375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 12:
If we divide 0 by 80, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 1539.2375
If we take 0 away from 0, we end up 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 quotient of the division is 1539.2375, and the remainder is 0.0.