We're dividing 991639 by 45 
Our goal is to divide 991639 by 45.

Let's proceed to step 1:
The number 45 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 45

Advancing to step 2:
The number 45 fits into 99 2 times, leaving a remainder of 9.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 90 away from 99, we end up with 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 45

Advancing to step 3:
The number 45 fits into 91 2 times, leaving a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
If we subtract 90 from 91, we get 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 45

Step 4:
45 goes into 16 0 times with a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 220.0
Subtract 0 from 16 to get 16.
Grab the next digit (3) from the dividend, add it to 16, then carry on: 163 / 45

On to step 5:
45 can be fit into 163 3 times, resulting in a remainder of 28.
The next digit of our result is 3. 
Result so far: 2203.0
Subtract 135 from 163 to get 28.
Bring next digit (9) of the dividend behind the 28 and repeat the process: 289 / 45

Let's proceed to step 6:
If we divide 289 by 45, we get 6 and a remainder of 19.
The next digit of our result is 6. 
Result so far: 22036.0
If we take 270 away from 289, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
The number 45 fits into 190 4 times, leaving a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 22036.4
Deduct 180 from 190 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
100 divided by 45 is 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 22036.42
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
45 can be fit into 100 2 times, resulting in a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 22036.422
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 22036.422 and a remainder of 0.001.