We're dividing 66000641 by 399 
Our goal is to divide 66000641 by 399.

Going ahead to step 1:
6 divided by 399 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 399

Advancing to step 2:
When dividing 66 by 399, we get 0 with a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Grab the next digit (0) from the dividend, add it to 66, then carry on: 660 / 399

On to step 3:
399 can be fit into 660 1 times, resulting in a remainder of 261.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 399 from 660 leaves us with 261.
Take the next digit (0) from the dividend and append it to 261, then repeat: 2610 / 399

On to step 4:
If we divide 2610 by 399, we get 6 and a remainder of 216.
Use 6 as the next digit of our solution. 
Result so far: 16.0
If we subtract 2394 from 2610, we get 216.
Append the next digit (0) from the dividend to 216 and continue with: 2160 / 399

Step 5:
The number 399 fits into 2160 5 times, leaving a remainder of 165.
Put 5 as the next digit of the answer. 
Result so far: 165.0
Deduct 1995 from 2160 and we're left with 165.
Take the next digit (6) from the dividend and append it to 165, then repeat: 1656 / 399

Advancing to step 6:
399 goes into 1656 4 times with a remainder of 60.
Put 4 as the next digit of the answer. 
Result so far: 1654.0
Deduct 1596 from 1656 and we're left with 60.
Take the next digit (4) from the dividend and append it to 60, then repeat: 604 / 399

Moving on to step 7:
399 goes into 604 1 times with a remainder of 205.
The number 1 becomes the next digit in our result. 
Result so far: 16541.0
If we take 399 away from 604, we end up with 205.
Grab the next digit (1) from the dividend, add it to 205, then carry on: 2051 / 399

Advancing to step 8:
If we divide 2051 by 399, we get 5 and a remainder of 56.
The number 5 becomes the next digit in our result. 
Result so far: 165415.0
Subtracting 1995 from 2051 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 9:
If we divide 560 by 399, we get 1 and a remainder of 161.
Put 1 as the next digit of the answer. 
Result so far: 165415.1
If we subtract 399 from 560, we get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Let's proceed to step 10:
399 can be fit into 1610 4 times, resulting in a remainder of 14.
Put 4 as the next digit of the answer. 
Result so far: 165415.14
If we subtract 1596 from 1610, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 11:
399 can be fit into 140 0 times, resulting in a remainder of 140.
Use 0 as the next digit of our solution. 
Result so far: 165415.14
Deduct 0 from 140 and we're left with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 12:
1400 divided by 399 is 3 with a remainder of 203.
The number 3 becomes the next digit in our result. 
Result so far: 165415.1403
If we subtract 1197 from 1400, we get 203.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2030, and continue the process.

Let's proceed to step 13:
When dividing 2030 by 399, we get 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 165415.14035
If we take 1995 away from 2030, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 14:
350 divided by 399 is 0 with a remainder of 350.
Write down 0 as next digit of the result. 
Result so far: 165415.14035
Deduct 0 from 350 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Moving on to step 15:
3500 divided by 399 is 8 with a remainder of 308.
Use 8 as the next digit of our solution. 
Result so far: 165415.1403508
If we subtract 3192 from 3500, we get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Let's proceed to step 16:
When dividing 3080 by 399, we get 7 with a remainder of 287.
Record the quotient 7 as the next digit in the result. 
Result so far: 165415.14035087
If we take 2793 away from 3080, we end up with 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

After the division, we end up with 165415.14035087 and a remainder of 2.87e-07.