80399989 divided by 853 
We want to divide 80399989 by 853.

Going ahead to step 1:
The number 853 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 853

Let's proceed to step 2:
The number 853 fits into 80 0 times, leaving a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 80 leaves us with 80.
Grab the next digit (3) from the dividend, add it to 80, then carry on: 803 / 853

Advancing to step 3:
The number 853 fits into 803 0 times, leaving a remainder of 803.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 803 leaves us with 803.
Grab the next digit (9) from the dividend, add it to 803, then carry on: 8039 / 853

Moving on to step 4:
8039 divided by 853 is 9 with a remainder of 362.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we subtract 7677 from 8039, we get 362.
Bring next digit (9) of the dividend behind the 362 and repeat the process: 3629 / 853

Advancing to step 5:
If we divide 3629 by 853, we get 4 and a remainder of 217.
Write down 4 as next digit of the result. 
Result so far: 94.0
The remainder is 217 after subtracting 3412 from 3629.
Grab the next digit (9) from the dividend, add it to 217, then carry on: 2179 / 853

Advancing to step 6:
2179 divided by 853 is 2 with a remainder of 473.
Put 2 as the next digit of the answer. 
Result so far: 942.0
Deduct 1706 from 2179 and we're left with 473.
Append the next digit (8) from the dividend to 473 and continue with: 4738 / 853

On to step 7:
853 can be fit into 4738 5 times, resulting in a remainder of 473.
Write down 5 as next digit of the result. 
Result so far: 9425.0
The remainder is 473 after subtracting 4265 from 4738.
Fetch the next digit (9) from the dividend, attach it to 473 and continue: 4739 / 853

Advancing to step 8:
The number 853 fits into 4739 5 times, leaving a remainder of 474.
Write down 5 as next digit of the result. 
Result so far: 94255.0
If we take 4265 away from 4739, we end up with 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

Let's proceed to step 9:
853 can be fit into 4740 5 times, resulting in a remainder of 475.
Use 5 as the next digit of our solution. 
Result so far: 94255.5
If we subtract 4265 from 4740, we get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Going ahead to step 10:
If we divide 4750 by 853, we get 5 and a remainder of 485.
Put 5 as the next digit of the answer. 
Result so far: 94255.55
Subtracting 4265 from 4750 leaves us with 485.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4850, and continue the process.

In conclusion, the division gives 94255.55 with a balance of 0.485.