We look at the division of 129516 by 80 
We're looking to find how many times 80 goes into 129516.

Going ahead to step 1:
When dividing 1 by 80, we get 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 80

Let's proceed to step 2:
80 can be fit into 12 0 times, resulting in a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 80

Advancing to step 3:
129 divided by 80 is 1 with a remainder of 49.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 80 from 129 to get 49.
Bring next digit (5) of the dividend behind the 49 and repeat the process: 495 / 80

Step 4:
When dividing 495 by 80, we get 6 with a remainder of 15.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we take 480 away from 495, we end up with 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 80

Step 5:
80 can be fit into 151 1 times, resulting in a remainder of 71.
Write down 1 as next digit of the result. 
Result so far: 161.0
If we subtract 80 from 151, we get 71.
Fetch the next digit (6) from the dividend, attach it to 71 and continue: 716 / 80

Moving on to step 6:
When dividing 716 by 80, we get 8 with a remainder of 76.
The next digit of our result is 8. 
Result so far: 1618.0
Deduct 640 from 716 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 7:
If we divide 760 by 80, we get 9 and a remainder of 40.
Record the quotient 9 as the next digit in the result. 
Result so far: 1618.9
Subtracting 720 from 760 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
80 goes into 400 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 1618.95
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.

Step 9:
When dividing 0 by 80, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 1618.95
If we subtract 0 from 0, we 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 10:
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: 1618.95
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 final outcome is 1618.95, with a leftover of 0.0.