We're dividing 66864964 by 621 
Our goal is to divide 66864964 by 621.

Going ahead to step 1:
6 divided by 621 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 621

Advancing to step 2:
621 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
Deduct 0 from 66 and we're left with 66.
Take the next digit (8) from the dividend and append it to 66, then repeat: 668 / 621

On to step 3:
If we divide 668 by 621, we get 1 and a remainder of 47.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 621 from 668 and we're left with 47.
Append the next digit (6) from the dividend to 47 and continue with: 476 / 621

Advancing to step 4:
621 can be fit into 476 0 times, resulting in a remainder of 476.
The next digit of our result is 0. 
Result so far: 10.0
Subtract 0 from 476 to get 476.
Take the next digit (4) from the dividend and append it to 476, then repeat: 4764 / 621

Step 5:
If we divide 4764 by 621, we get 7 and a remainder of 417.
The number 7 becomes the next digit in our result. 
Result so far: 107.0
Subtracting 4347 from 4764 leaves us with 417.
Grab the next digit (9) from the dividend, add it to 417, then carry on: 4179 / 621

Moving on to step 6:
When dividing 4179 by 621, we get 6 with a remainder of 453.
Use 6 as the next digit of our solution. 
Result so far: 1076.0
Subtract 3726 from 4179 to get 453.
Fetch the next digit (6) from the dividend, attach it to 453 and continue: 4536 / 621

On to step 7:
621 can be fit into 4536 7 times, resulting in a remainder of 189.
The number 7 becomes the next digit in our result. 
Result so far: 10767.0
If we take 4347 away from 4536, we end up with 189.
Take the next digit (4) from the dividend and append it to 189, then repeat: 1894 / 621

Going ahead to step 8:
When dividing 1894 by 621, we get 3 with a remainder of 31.
Write down 3 as next digit of the result. 
Result so far: 107673.0
Subtracting 1863 from 1894 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 9:
310 divided by 621 is 0 with a remainder of 310.
The number 0 becomes the next digit in our result. 
Result so far: 107673.0
The remainder is 310 after subtracting 0 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Moving on to step 10:
621 goes into 3100 4 times with a remainder of 616.
Record the quotient 4 as the next digit in the result. 
Result so far: 107673.04
Subtract 2484 from 3100 to get 616.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6160, and continue the process.

On to step 11:
The number 621 fits into 6160 9 times, leaving a remainder of 571.
The number 9 becomes the next digit in our result. 
Result so far: 107673.049
The remainder is 571 after subtracting 5589 from 6160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5710, and continue the process.

Advancing to step 12:
621 goes into 5710 9 times with a remainder of 121.
Use 9 as the next digit of our solution. 
Result so far: 107673.0499
Subtracting 5589 from 5710 leaves us with 121.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1210, and continue the process.

After the division, we end up with 107673.0499 and a remainder of 0.00121.