6645871 ÷ 199 
Our goal is to divide 6645871 by 199.

Let's proceed to step 1:
199 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 199

Going ahead to step 2:
199 can be fit into 66 0 times, resulting in a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Take the next digit (4) from the dividend and append it to 66, then repeat: 664 / 199

Step 3:
664 divided by 199 is 3 with a remainder of 67.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 597 from 664 to get 67.
Take the next digit (5) from the dividend and append it to 67, then repeat: 675 / 199

Let's proceed to step 4:
675 divided by 199 is 3 with a remainder of 78.
The next digit of our result is 3. 
Result so far: 33.0
If we subtract 597 from 675, we get 78.
Grab the next digit (8) from the dividend, add it to 78, then carry on: 788 / 199

Going ahead to step 5:
If we divide 788 by 199, we get 3 and a remainder of 191.
The number 3 becomes the next digit in our result. 
Result so far: 333.0
Subtracting 597 from 788 leaves us with 191.
Take the next digit (7) from the dividend and append it to 191, then repeat: 1917 / 199

Let's proceed to step 6:
1917 divided by 199 is 9 with a remainder of 126.
Put 9 as the next digit of the answer. 
Result so far: 3339.0
Subtracting 1791 from 1917 leaves us with 126.
Fetch the next digit (1) from the dividend, attach it to 126 and continue: 1261 / 199

Moving on to step 7:
If we divide 1261 by 199, we get 6 and a remainder of 67.
Record the quotient 6 as the next digit in the result. 
Result so far: 33396.0
Subtract 1194 from 1261 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 8:
The number 199 fits into 670 3 times, leaving a remainder of 73.
The next digit of our result is 3. 
Result so far: 33396.3
Deduct 597 from 670 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Step 9:
199 goes into 730 3 times with a remainder of 133.
Write down 3 as next digit of the result. 
Result so far: 33396.33
Subtracting 597 from 730 leaves us with 133.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1330, and continue the process.

The final result is 33396.33 with a remainder of 0.133.