809251 ÷ 80 
Our goal is to divide 809251 by 80.

Advancing to step 1:
When dividing 8 by 80, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 80

Advancing to step 2:
80 divided by 80 is 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 80 from 80, we get 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 80

Step 3:
80 can be fit into 9 0 times, resulting in a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 9 to get 9.
Grab the next digit (2) from the dividend, add it to 9, then carry on: 92 / 80

Going ahead to step 4:
When dividing 92 by 80, we get 1 with a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 101.0
Subtract 80 from 92 to get 12.
Take the next digit (5) from the dividend and append it to 12, then repeat: 125 / 80

Step 5:
The number 80 fits into 125 1 times, leaving a remainder of 45.
The next digit of our result is 1. 
Result so far: 1011.0
Subtract 80 from 125 to get 45.
Fetch the next digit (1) from the dividend, attach it to 45 and continue: 451 / 80

Going ahead to step 6:
80 goes into 451 5 times with a remainder of 51.
Record the quotient 5 as the next digit in the result. 
Result so far: 10115.0
If we take 400 away from 451, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Moving on to step 7:
510 divided by 80 is 6 with a remainder of 30.
The number 6 becomes the next digit in our result. 
Result so far: 10115.6
Subtract 480 from 510 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 8:
When dividing 300 by 80, we get 3 with a remainder of 60.
Use 3 as the next digit of our solution. 
Result so far: 10115.63
Subtracting 240 from 300 leaves us 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.

Moving on to step 9:
The number 80 fits into 600 7 times, leaving a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 10115.637
Subtracting 560 from 600 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.

Moving on to step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 10115.6375
Subtract 400 from 400 to 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.

On to step 11:
0 divided by 80 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 10115.6375
Subtract 0 from 0 to 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 12:
If we divide 0 by 80, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10115.6375
Subtracting 0 from 0 leaves us 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 10115.6375 and a remainder of 0.0.