We look at the division of 863849 by 661 
Let's see how many times 661 fits into 863849.

Step 1:
The number 661 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 661

Going ahead to step 2:
661 can be fit into 86 0 times, resulting in a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Include the next digit (3) from the dividend after 86, then repeat: 863 / 661

Step 3:
863 divided by 661 is 1 with a remainder of 202.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 661 from 863, we get 202.
Append the next digit (8) from the dividend to 202 and continue with: 2028 / 661

Advancing to step 4:
The number 661 fits into 2028 3 times, leaving a remainder of 45.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 1983 from 2028, we get 45.
Include the next digit (4) from the dividend after 45, then repeat: 454 / 661

Step 5:
661 goes into 454 0 times with a remainder of 454.
Put 0 as the next digit of the answer. 
Result so far: 130.0
Subtract 0 from 454 to get 454.
Take the next digit (9) from the dividend and append it to 454, then repeat: 4549 / 661

Moving on to step 6:
661 can be fit into 4549 6 times, resulting in a remainder of 583.
The number 6 becomes the next digit in our result. 
Result so far: 1306.0
Subtracting 3966 from 4549 leaves us with 583.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5830, and continue the process.

Going ahead to step 7:
661 can be fit into 5830 8 times, resulting in a remainder of 542.
The number 8 becomes the next digit in our result. 
Result so far: 1306.8
Subtract 5288 from 5830 to get 542.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5420, and continue the process.

On to step 8:
The number 661 fits into 5420 8 times, leaving a remainder of 132.
Put 8 as the next digit of the answer. 
Result so far: 1306.88
If we subtract 5288 from 5420, we get 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

The final outcome is 1306.88, with a leftover of 0.132.