We look at the division of 840644 by 80 
Our goal is to divide 840644 by 80.

Moving on to step 1:
80 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 80

Advancing to step 2:
The number 80 fits into 84 1 times, leaving a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 80 away from 84, we end up with 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 80

Step 3:
The number 80 fits into 40 0 times, leaving a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 40, we end up with 40.
Grab the next digit (6) from the dividend, add it to 40, then carry on: 406 / 80

Going ahead to step 4:
406 divided by 80 is 5 with a remainder of 6.
Put 5 as the next digit of the answer. 
Result so far: 105.0
Subtract 400 from 406 to get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 80

Moving on to step 5:
If we divide 64 by 80, we get 0 and a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 1050.0
Deduct 0 from 64 and we're left with 64.
Include the next digit (4) from the dividend after 64, then repeat: 644 / 80

Step 6:
80 can be fit into 644 8 times, resulting in a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 10508.0
If we subtract 640 from 644, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 7:
40 divided by 80 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 10508.0
Subtracting 0 from 40 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.

Going ahead to step 8:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 10508.05
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 9:
80 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 10508.05
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.

On to step 10:
When dividing 0 by 80, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10508.05
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.

The final outcome is 10508.05, with a leftover of 0.0.