We're dividing 840780 by 80 
We're looking to find how many times 80 goes into 840780.

Step 1:
The number 80 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (4) from the dividend after 8, then repeat: 84 / 80

Moving on to step 2:
80 goes into 84 1 times with a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 80 from 84 to get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 80

On to step 3:
The number 80 fits into 40 0 times, leaving a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we subtract 0 from 40, we get 40.
Grab the next digit (7) from the dividend, add it to 40, then carry on: 407 / 80

On to step 4:
If we divide 407 by 80, we get 5 and a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 105.0
If we take 400 away from 407, we end up with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 80

Advancing to step 5:
If we divide 78 by 80, we get 0 and a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 1050.0
If we take 0 away from 78, we end up with 78.
Take the next digit (0) from the dividend and append it to 78, then repeat: 780 / 80

Moving on to step 6:
80 can be fit into 780 9 times, resulting in a remainder of 60.
Put 9 as the next digit of the answer. 
Result so far: 10509.0
If we subtract 720 from 780, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 7:
80 can be fit into 600 7 times, resulting in a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 10509.7
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.

Going ahead to step 8:
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: 10509.75
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.

Step 9:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 10509.75
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.

Advancing to step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10509.75
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.

In conclusion, the division gives 10509.75 with a balance of 0.0.