855983 ÷ 90 
Our goal is to divide 855983 by 90.

Step 1:
When dividing 8 by 90, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 90

Going ahead to step 2:
85 divided by 90 is 0 with a remainder of 85.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 85 after subtracting 0 from 85.
Append the next digit (5) from the dividend to 85 and continue with: 855 / 90

On to step 3:
When dividing 855 by 90, we get 9 with a remainder of 45.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 810 from 855 to get 45.
Fetch the next digit (9) from the dividend, attach it to 45 and continue: 459 / 90

Advancing to step 4:
The number 90 fits into 459 5 times, leaving a remainder of 9.
Write down 5 as next digit of the result. 
Result so far: 95.0
Subtract 450 from 459 to get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 90

On to step 5:
When dividing 98 by 90, we get 1 with a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 951.0
If we subtract 90 from 98, we get 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 90

Moving on to step 6:
90 can be fit into 83 0 times, resulting in a remainder of 83.
The next digit of our result is 0. 
Result so far: 9510.0
Deduct 0 from 83 and we're left with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Step 7:
When dividing 830 by 90, we get 9 with a remainder of 20.
The number 9 becomes the next digit in our result. 
Result so far: 9510.9
The remainder is 20 after subtracting 810 from 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 8:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 9510.92
If we subtract 180 from 200, 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.

Going ahead to step 9:
200 divided by 90 is 2 with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 9510.922
Subtract 180 from 200 to 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.

The final result is 9510.922 with a remainder of 0.002.