80686937 ÷ 90 
Let's see how many times 90 fits into 80686937.

Advancing to step 1:
90 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 90

Going ahead to step 2:
The number 90 fits into 80 0 times, leaving a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Grab the next digit (6) from the dividend, add it to 80, then carry on: 806 / 90

Going ahead to step 3:
The number 90 fits into 806 8 times, leaving a remainder of 86.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 720 from 806, we get 86.
Take the next digit (8) from the dividend and append it to 86, then repeat: 868 / 90

Advancing to step 4:
If we divide 868 by 90, we get 9 and a remainder of 58.
The number 9 becomes the next digit in our result. 
Result so far: 89.0
If we subtract 810 from 868, we get 58.
Include the next digit (6) from the dividend after 58, then repeat: 586 / 90

Advancing to step 5:
The number 90 fits into 586 6 times, leaving a remainder of 46.
Use 6 as the next digit of our solution. 
Result so far: 896.0
Subtracting 540 from 586 leaves us with 46.
Bring next digit (9) of the dividend behind the 46 and repeat the process: 469 / 90

On to step 6:
90 goes into 469 5 times with a remainder of 19.
The next digit of our result is 5. 
Result so far: 8965.0
If we subtract 450 from 469, we get 19.
Include the next digit (3) from the dividend after 19, then repeat: 193 / 90

On to step 7:
193 divided by 90 is 2 with a remainder of 13.
Write down 2 as next digit of the result. 
Result so far: 89652.0
Subtract 180 from 193 to get 13.
Bring next digit (7) of the dividend behind the 13 and repeat the process: 137 / 90

On to step 8:
90 goes into 137 1 times with a remainder of 47.
Put 1 as the next digit of the answer. 
Result so far: 896521.0
Subtracting 90 from 137 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 9:
90 can be fit into 470 5 times, resulting in a remainder of 20.
The next digit of our result is 5. 
Result so far: 896521.5
Subtracting 450 from 470 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 10:
If we divide 200 by 90, we get 2 and a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 896521.52
Subtracting 180 from 200 leaves us with 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 11:
If we divide 200 by 90, we get 2 and a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 896521.522
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 896521.522 with a remainder of 0.002.