12729 ÷ 80 
We want to figure out the number of times 12729 can be divided by 80.

Let's proceed to step 1:
If we divide 1 by 80, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 80

Moving on to step 2:
80 goes into 12 0 times with a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Append the next digit (7) from the dividend to 12 and continue with: 127 / 80

Going ahead to step 3:
127 divided by 80 is 1 with a remainder of 47.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 80 from 127, we get 47.
Take the next digit (2) from the dividend and append it to 47, then repeat: 472 / 80

On to step 4:
When dividing 472 by 80, we get 5 with a remainder of 72.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we subtract 400 from 472, we get 72.
Bring next digit (9) of the dividend behind the 72 and repeat the process: 729 / 80

On to step 5:
729 divided by 80 is 9 with a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 159.0
If we take 720 away from 729, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 6:
The number 80 fits into 90 1 times, leaving a remainder of 10.
The next digit of our result is 1. 
Result so far: 159.1
The remainder is 10 after subtracting 80 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
80 can be fit into 100 1 times, resulting in a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 159.11
Subtracting 80 from 100 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 159.11 with a remaining 0.02.