We look at the division of 139551 by 80 
We're looking to find how many times 80 goes into 139551.

Step 1:
If we divide 1 by 80, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 80

Going ahead to step 2:
When dividing 13 by 80, we get 0 with a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 13, we end up with 13.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 80

On to step 3:
139 divided by 80 is 1 with a remainder of 59.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 80 from 139 leaves us with 59.
Append the next digit (5) from the dividend to 59 and continue with: 595 / 80

Going ahead to step 4:
595 divided by 80 is 7 with a remainder of 35.
Use 7 as the next digit of our solution. 
Result so far: 17.0
If we take 560 away from 595, we end up with 35.
Take the next digit (5) from the dividend and append it to 35, then repeat: 355 / 80

Let's proceed to step 5:
If we divide 355 by 80, we get 4 and a remainder of 35.
Put 4 as the next digit of the answer. 
Result so far: 174.0
If we take 320 away from 355, we end up with 35.
Grab the next digit (1) from the dividend, add it to 35, then carry on: 351 / 80

Advancing to step 6:
80 can be fit into 351 4 times, resulting in a remainder of 31.
The number 4 becomes the next digit in our result. 
Result so far: 1744.0
If we take 320 away from 351, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 7:
310 divided by 80 is 3 with a remainder of 70.
Use 3 as the next digit of our solution. 
Result so far: 1744.3
The remainder is 70 after subtracting 240 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 8:
700 divided by 80 is 8 with a remainder of 60.
Put 8 as the next digit of the answer. 
Result so far: 1744.38
Subtract 640 from 700 to 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.

Moving on to step 9:
80 can be fit into 600 7 times, resulting in a remainder of 40.
The next digit of our result is 7. 
Result so far: 1744.387
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.

Moving on to step 10:
When dividing 400 by 80, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 1744.3875
If we take 400 away from 400, 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.

On to 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: 1744.3875
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.

Moving on to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1744.3875
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.

After the division, we end up with 1744.3875 and a remainder of 0.0.