We're dividing 866066 by 90 
We're looking to find how many times 90 goes into 866066.

Step 1:
90 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
If we take 0 away from 8, we end up with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 90

Step 2:
90 can be fit into 86 0 times, resulting in a remainder of 86.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Append the next digit (6) from the dividend to 86 and continue with: 866 / 90

On to step 3:
The number 90 fits into 866 9 times, leaving a remainder of 56.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 56 after subtracting 810 from 866.
Include the next digit (0) from the dividend after 56, then repeat: 560 / 90

Moving on to step 4:
If we divide 560 by 90, we get 6 and a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 96.0
Deduct 540 from 560 and we're left with 20.
Grab the next digit (6) from the dividend, add it to 20, then carry on: 206 / 90

Step 5:
The number 90 fits into 206 2 times, leaving a remainder of 26.
Put 2 as the next digit of the answer. 
Result so far: 962.0
If we take 180 away from 206, we end up with 26.
Bring next digit (6) of the dividend behind the 26 and repeat the process: 266 / 90

Going ahead to step 6:
90 goes into 266 2 times with a remainder of 86.
Put 2 as the next digit of the answer. 
Result so far: 9622.0
Deduct 180 from 266 and we're left with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 7:
90 goes into 860 9 times with a remainder of 50.
The next digit of our result is 9. 
Result so far: 9622.9
Subtract 810 from 860 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 8:
If we divide 500 by 90, we get 5 and a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 9622.95
Subtracting 450 from 500 leaves us 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.

Step 9:
When dividing 500 by 90, we get 5 with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 9622.955
If we take 450 away from 500, 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.

After the division, we end up with 9622.955 and a remainder of 0.005.