We're dividing 866685 by 90 
We want to figure out the number of times 866685 can be divided by 90.

On to step 1:
8 divided by 90 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 90

On to step 2:
90 goes into 86 0 times with a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 86 to get 86.
Include the next digit (6) from the dividend after 86, then repeat: 866 / 90

Going ahead to step 3:
If we divide 866 by 90, we get 9 and a remainder of 56.
Put 9 as the next digit of the answer. 
Result so far: 9.0
If we take 810 away from 866, we end up with 56.
Bring next digit (6) of the dividend behind the 56 and repeat the process: 566 / 90

Moving on to step 4:
The number 90 fits into 566 6 times, leaving a remainder of 26.
Write down 6 as next digit of the result. 
Result so far: 96.0
The remainder is 26 after subtracting 540 from 566.
Append the next digit (8) from the dividend to 26 and continue with: 268 / 90

Going ahead to step 5:
The number 90 fits into 268 2 times, leaving a remainder of 88.
The next digit of our result is 2. 
Result so far: 962.0
Subtract 180 from 268 to get 88.
Include the next digit (5) from the dividend after 88, then repeat: 885 / 90

Going ahead to step 6:
When dividing 885 by 90, we get 9 with a remainder of 75.
The number 9 becomes the next digit in our result. 
Result so far: 9629.0
The remainder is 75 after subtracting 810 from 885.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 7:
If we divide 750 by 90, we get 8 and a remainder of 30.
Put 8 as the next digit of the answer. 
Result so far: 9629.8
If we take 720 away from 750, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 8:
90 can be fit into 300 3 times, resulting in a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 9629.83
Subtracting 270 from 300 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 9:
The number 90 fits into 300 3 times, leaving a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 9629.833
Subtract 270 from 300 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Our division results in 9629.833 with a remaining 0.003.