815531 divided by 80 
Our goal is to divide 815531 by 80.

On to step 1:
80 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 80

On to step 2:
80 can be fit into 81 1 times, resulting in a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 80 from 81, we get 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 80

On to step 3:
The number 80 fits into 15 0 times, leaving a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 15 to get 15.
Bring next digit (5) of the dividend behind the 15 and repeat the process: 155 / 80

Moving on to step 4:
When dividing 155 by 80, we get 1 with a remainder of 75.
The next digit of our result is 1. 
Result so far: 101.0
If we take 80 away from 155, we end up with 75.
Bring next digit (3) of the dividend behind the 75 and repeat the process: 753 / 80

Let's proceed to step 5:
80 can be fit into 753 9 times, resulting in a remainder of 33.
The next digit of our result is 9. 
Result so far: 1019.0
The remainder is 33 after subtracting 720 from 753.
Include the next digit (1) from the dividend after 33, then repeat: 331 / 80

Step 6:
When dividing 331 by 80, we get 4 with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 10194.0
Subtract 320 from 331 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 7:
If we divide 110 by 80, we get 1 and a remainder of 30.
The number 1 becomes the next digit in our result. 
Result so far: 10194.1
Subtracting 80 from 110 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
The number 80 fits into 300 3 times, leaving a remainder of 60.
Use 3 as the next digit of our solution. 
Result so far: 10194.13
If we take 240 away from 300, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 9:
The number 80 fits into 600 7 times, leaving a remainder of 40.
The next digit of our result is 7. 
Result so far: 10194.137
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:
If we divide 400 by 80, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 10194.1375
Deduct 400 from 400 and we're left 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 11:
If we divide 0 by 80, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10194.1375
Deduct 0 from 0 and we're left 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 12:
0 divided by 80 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10194.1375
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.

After the division, we end up with 10194.1375 and a remainder of 0.0.