We're dividing 66681642 by 648 
We're looking to find how many times 648 goes into 66681642.

On to step 1:
If we divide 6 by 648, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 648

On to step 2:
If we divide 66 by 648, we get 0 and a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Include the next digit (6) from the dividend after 66, then repeat: 666 / 648

Moving on to step 3:
The number 648 fits into 666 1 times, leaving a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 18 after subtracting 648 from 666.
Take the next digit (8) from the dividend and append it to 18, then repeat: 188 / 648

On to step 4:
188 divided by 648 is 0 with a remainder of 188.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Deduct 0 from 188 and we're left with 188.
Append the next digit (1) from the dividend to 188 and continue with: 1881 / 648

Let's proceed to step 5:
If we divide 1881 by 648, we get 2 and a remainder of 585.
The next digit of our result is 2. 
Result so far: 102.0
If we subtract 1296 from 1881, we get 585.
Bring next digit (6) of the dividend behind the 585 and repeat the process: 5856 / 648

Step 6:
5856 divided by 648 is 9 with a remainder of 24.
Record the quotient 9 as the next digit in the result. 
Result so far: 1029.0
Subtracting 5832 from 5856 leaves us with 24.
Bring next digit (4) of the dividend behind the 24 and repeat the process: 244 / 648

On to step 7:
648 can be fit into 244 0 times, resulting in a remainder of 244.
Put 0 as the next digit of the answer. 
Result so far: 10290.0
The remainder is 244 after subtracting 0 from 244.
Append the next digit (2) from the dividend to 244 and continue with: 2442 / 648

Moving on to step 8:
2442 divided by 648 is 3 with a remainder of 498.
Record the quotient 3 as the next digit in the result. 
Result so far: 102903.0
If we take 1944 away from 2442, we end up with 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

On to step 9:
The number 648 fits into 4980 7 times, leaving a remainder of 444.
Use 7 as the next digit of our solution. 
Result so far: 102903.7
If we take 4536 away from 4980, we end up with 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

Step 10:
If we divide 4440 by 648, we get 6 and a remainder of 552.
The number 6 becomes the next digit in our result. 
Result so far: 102903.76
Subtracting 3888 from 4440 leaves us with 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

On to step 11:
648 can be fit into 5520 8 times, resulting in a remainder of 336.
The next digit of our result is 8. 
Result so far: 102903.768
If we take 5184 away from 5520, we end up with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

On to step 12:
3360 divided by 648 is 5 with a remainder of 120.
Put 5 as the next digit of the answer. 
Result so far: 102903.7685
If we subtract 3240 from 3360, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 13:
When dividing 1200 by 648, we get 1 with a remainder of 552.
Put 1 as the next digit of the answer. 
Result so far: 102903.76851
If we subtract 648 from 1200, we get 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

On to step 14:
5520 divided by 648 is 8 with a remainder of 336.
Write down 8 as next digit of the result. 
Result so far: 102903.768518
Subtract 5184 from 5520 to get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Step 15:
If we divide 3360 by 648, we get 5 and a remainder of 120.
Record the quotient 5 as the next digit in the result. 
Result so far: 102903.7685185
Deduct 3240 from 3360 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 16:
If we divide 1200 by 648, we get 1 and a remainder of 552.
Write down 1 as next digit of the result. 
Result so far: 102903.76851851
If we take 648 away from 1200, we end up with 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

The final result is 102903.76851851 with a remainder of 5.52e-07.