We're dividing 3989501 by 661 
We want to figure out the number of times 3989501 can be divided by 661.

On to step 1:
If we divide 3 by 661, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 661

Let's proceed to step 2:
When dividing 39 by 661, we get 0 with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Include the next digit (8) from the dividend after 39, then repeat: 398 / 661

Advancing to step 3:
661 can be fit into 398 0 times, resulting in a remainder of 398.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 398 leaves us with 398.
Append the next digit (9) from the dividend to 398 and continue with: 3989 / 661

On to step 4:
If we divide 3989 by 661, we get 6 and a remainder of 23.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtract 3966 from 3989 to get 23.
Take the next digit (5) from the dividend and append it to 23, then repeat: 235 / 661

On to step 5:
235 divided by 661 is 0 with a remainder of 235.
Use 0 as the next digit of our solution. 
Result so far: 60.0
Deduct 0 from 235 and we're left with 235.
Include the next digit (0) from the dividend after 235, then repeat: 2350 / 661

Going ahead to step 6:
The number 661 fits into 2350 3 times, leaving a remainder of 367.
The next digit of our result is 3. 
Result so far: 603.0
Deduct 1983 from 2350 and we're left with 367.
Fetch the next digit (1) from the dividend, attach it to 367 and continue: 3671 / 661

Advancing to step 7:
The number 661 fits into 3671 5 times, leaving a remainder of 366.
The number 5 becomes the next digit in our result. 
Result so far: 6035.0
Deduct 3305 from 3671 and we're left with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

On to step 8:
If we divide 3660 by 661, we get 5 and a remainder of 355.
Record the quotient 5 as the next digit in the result. 
Result so far: 6035.5
If we subtract 3305 from 3660, we get 355.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3550, and continue the process.

Going ahead to step 9:
3550 divided by 661 is 5 with a remainder of 245.
The number 5 becomes the next digit in our result. 
Result so far: 6035.55
The remainder is 245 after subtracting 3305 from 3550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

The final result is 6035.55 with a remainder of 0.245.