We look at the division of 159972 by 80 
Let's see how many times 80 fits into 159972.

Moving on to step 1:
80 can be fit into 1 0 times, resulting in 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.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 80

On to step 2:
When dividing 15 by 80, we get 0 with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 80

Step 3:
If we divide 159 by 80, we get 1 and a remainder of 79.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 79 after subtracting 80 from 159.
Include the next digit (9) from the dividend after 79, then repeat: 799 / 80

On to step 4:
799 divided by 80 is 9 with a remainder of 79.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtracting 720 from 799 leaves us with 79.
Include the next digit (7) from the dividend after 79, then repeat: 797 / 80

On to step 5:
797 divided by 80 is 9 with a remainder of 77.
Put 9 as the next digit of the answer. 
Result so far: 199.0
If we subtract 720 from 797, we get 77.
Fetch the next digit (2) from the dividend, attach it to 77 and continue: 772 / 80

Moving on to step 6:
772 divided by 80 is 9 with a remainder of 52.
Put 9 as the next digit of the answer. 
Result so far: 1999.0
If we take 720 away from 772, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 7:
When dividing 520 by 80, we get 6 with a remainder of 40.
Write down 6 as next digit of the result. 
Result so far: 1999.6
Deduct 480 from 520 and we're left 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.

Going ahead to step 8:
400 divided by 80 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 1999.65
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.

Advancing to step 9:
80 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1999.65
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.
The next digit of our result is 0. 
Result so far: 1999.65
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.

The quotient of the division is 1999.65, and the remainder is 0.0.