6421660 divided by 672 
We want to divide 6421660 by 672.

Step 1:
6 divided by 672 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 672

On to step 2:
If we divide 64 by 672, we get 0 and a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Take the next digit (2) from the dividend and append it to 64, then repeat: 642 / 672

Going ahead to step 3:
When dividing 642 by 672, we get 0 with a remainder of 642.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 642, we get 642.
Grab the next digit (1) from the dividend, add it to 642, then carry on: 6421 / 672

Let's proceed to step 4:
If we divide 6421 by 672, we get 9 and a remainder of 373.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
The remainder is 373 after subtracting 6048 from 6421.
Include the next digit (6) from the dividend after 373, then repeat: 3736 / 672

Going ahead to step 5:
672 goes into 3736 5 times with a remainder of 376.
Record the quotient 5 as the next digit in the result. 
Result so far: 95.0
The remainder is 376 after subtracting 3360 from 3736.
Append the next digit (6) from the dividend to 376 and continue with: 3766 / 672

Moving on to step 6:
If we divide 3766 by 672, we get 5 and a remainder of 406.
Use 5 as the next digit of our solution. 
Result so far: 955.0
If we take 3360 away from 3766, we end up with 406.
Take the next digit (0) from the dividend and append it to 406, then repeat: 4060 / 672

Step 7:
The number 672 fits into 4060 6 times, leaving a remainder of 28.
Use 6 as the next digit of our solution. 
Result so far: 9556.0
Deduct 4032 from 4060 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 8:
The number 672 fits into 280 0 times, leaving a remainder of 280.
Use 0 as the next digit of our solution. 
Result so far: 9556.0
Subtract 0 from 280 to get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 9:
672 can be fit into 2800 4 times, resulting in a remainder of 112.
The number 4 becomes the next digit in our result. 
Result so far: 9556.04
Deduct 2688 from 2800 and we're left with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Moving on to step 10:
If we divide 1120 by 672, we get 1 and a remainder of 448.
Use 1 as the next digit of our solution. 
Result so far: 9556.041
Deduct 672 from 1120 and we're left with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

On to step 11:
When dividing 4480 by 672, we get 6 with a remainder of 448.
The next digit of our result is 6. 
Result so far: 9556.0416
Subtract 4032 from 4480 to get 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Let's proceed to step 12:
4480 divided by 672 is 6 with a remainder of 448.
The number 6 becomes the next digit in our result. 
Result so far: 9556.04166
If we take 4032 away from 4480, we end up with 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

In conclusion, the division gives 9556.04166 with a balance of 0.000448.