Let's divide 900999 by 90
We want to divide 900999 by 90.

Step 1:
If we divide 9 by 90, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 90

On to step 2:
The number 90 fits into 90 1 times, leaving a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
If we take 90 away from 90, we end up with 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 90

Going ahead to step 3:
The number 90 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Deduct 0 from 0 and we're left with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 90

Going ahead to step 4:
9 divided by 90 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 100.0
Subtract 0 from 9 to get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 90

On to step 5:
The number 90 fits into 99 1 times, leaving a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1001.0
Subtracting 90 from 99 leaves us with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 90

Let's proceed to step 6:
If we divide 99 by 90, we get 1 and a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 10011.0
If we subtract 90 from 99, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
If we divide 90 by 90, we get 1 and a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 10011.1
Subtract 90 from 90 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
90 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10011.1
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
If we divide 0 by 90, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10011.1
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 10011.1, with a leftover of 0.0.