We look at the division of 15721849 by 80 
Our goal is to divide 15721849 by 80.

Going ahead to step 1:
The number 80 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 80

On to step 2:
80 can be fit into 15 0 times, resulting in a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Bring next digit (7) of the dividend behind the 15 and repeat the process: 157 / 80

On to step 3:
The number 80 fits into 157 1 times, leaving a remainder of 77.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 80 away from 157, we end up with 77.
Include the next digit (2) from the dividend after 77, then repeat: 772 / 80

Step 4:
80 goes into 772 9 times with a remainder of 52.
Use 9 as the next digit of our solution. 
Result so far: 19.0
If we subtract 720 from 772, we get 52.
Include the next digit (1) from the dividend after 52, then repeat: 521 / 80

Advancing to step 5:
The number 80 fits into 521 6 times, leaving a remainder of 41.
Use 6 as the next digit of our solution. 
Result so far: 196.0
The remainder is 41 after subtracting 480 from 521.
Fetch the next digit (8) from the dividend, attach it to 41 and continue: 418 / 80

Let's proceed to step 6:
The number 80 fits into 418 5 times, leaving a remainder of 18.
Put 5 as the next digit of the answer. 
Result so far: 1965.0
Deduct 400 from 418 and we're left with 18.
Append the next digit (4) from the dividend to 18 and continue with: 184 / 80

Advancing to step 7:
80 goes into 184 2 times with a remainder of 24.
The next digit of our result is 2. 
Result so far: 19652.0
Subtract 160 from 184 to get 24.
Fetch the next digit (9) from the dividend, attach it to 24 and continue: 249 / 80

Step 8:
The number 80 fits into 249 3 times, leaving a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 196523.0
Subtract 240 from 249 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 9:
When dividing 90 by 80, we get 1 with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 196523.1
Subtract 80 from 90 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
If we divide 100 by 80, we get 1 and a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 196523.11
Subtract 80 from 100 to get 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 196523.11 with a remaining 0.02.