863989 ÷ 80 
Our goal is to divide 863989 by 80.

Step 1:
80 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 80

Moving on to step 2:
The number 80 fits into 86 1 times, leaving a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 80 from 86 to get 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 80

On to step 3:
63 divided by 80 is 0 with a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
The remainder is 63 after subtracting 0 from 63.
Fetch the next digit (9) from the dividend, attach it to 63 and continue: 639 / 80

Moving on to step 4:
80 can be fit into 639 7 times, resulting in a remainder of 79.
Use 7 as the next digit of our solution. 
Result so far: 107.0
If we take 560 away from 639, we end up with 79.
Bring next digit (8) of the dividend behind the 79 and repeat the process: 798 / 80

Step 5:
798 divided by 80 is 9 with a remainder of 78.
Write down 9 as next digit of the result. 
Result so far: 1079.0
If we take 720 away from 798, we end up with 78.
Fetch the next digit (9) from the dividend, attach it to 78 and continue: 789 / 80

Let's proceed to step 6:
If we divide 789 by 80, we get 9 and a remainder of 69.
The next digit of our result is 9. 
Result so far: 10799.0
The remainder is 69 after subtracting 720 from 789.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 7:
690 divided by 80 is 8 with a remainder of 50.
Use 8 as the next digit of our solution. 
Result so far: 10799.8
If we take 640 away from 690, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 8:
The number 80 fits into 500 6 times, leaving a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 10799.86
If we subtract 480 from 500, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
If we divide 200 by 80, we get 2 and a remainder of 40.
The number 2 becomes the next digit in our result. 
Result so far: 10799.862
If we take 160 away from 200, we end up 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 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: 10799.8625
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.

Moving on to step 11:
80 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10799.8625
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.

Going ahead 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: 10799.8625
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.

In conclusion, the division gives 10799.8625 with a balance of 0.0.