We look at the division of 66736918 by 644 
We want to divide 66736918 by 644.

Let's proceed to step 1:
644 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 644

Advancing to step 2:
66 divided by 644 is 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Include the next digit (7) from the dividend after 66, then repeat: 667 / 644

Advancing to step 3:
644 goes into 667 1 times with a remainder of 23.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 644 from 667 and we're left with 23.
Grab the next digit (3) from the dividend, add it to 23, then carry on: 233 / 644

Advancing to step 4:
When dividing 233 by 644, we get 0 with a remainder of 233.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtract 0 from 233 to get 233.
Take the next digit (6) from the dividend and append it to 233, then repeat: 2336 / 644

On to step 5:
644 goes into 2336 3 times with a remainder of 404.
Record the quotient 3 as the next digit in the result. 
Result so far: 103.0
Subtract 1932 from 2336 to get 404.
Bring next digit (9) of the dividend behind the 404 and repeat the process: 4049 / 644

Step 6:
When dividing 4049 by 644, we get 6 with a remainder of 185.
Record the quotient 6 as the next digit in the result. 
Result so far: 1036.0
The remainder is 185 after subtracting 3864 from 4049.
Take the next digit (1) from the dividend and append it to 185, then repeat: 1851 / 644

On to step 7:
When dividing 1851 by 644, we get 2 with a remainder of 563.
Write down 2 as next digit of the result. 
Result so far: 10362.0
Deduct 1288 from 1851 and we're left with 563.
Take the next digit (8) from the dividend and append it to 563, then repeat: 5638 / 644

Step 8:
644 goes into 5638 8 times with a remainder of 486.
Write down 8 as next digit of the result. 
Result so far: 103628.0
If we subtract 5152 from 5638, we get 486.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4860, and continue the process.

Going ahead to step 9:
644 goes into 4860 7 times with a remainder of 352.
Use 7 as the next digit of our solution. 
Result so far: 103628.7
Subtract 4508 from 4860 to get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Going ahead to step 10:
The number 644 fits into 3520 5 times, leaving a remainder of 300.
Write down 5 as next digit of the result. 
Result so far: 103628.75
Subtracting 3220 from 3520 leaves us with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Let's proceed to step 11:
644 can be fit into 3000 4 times, resulting in a remainder of 424.
Put 4 as the next digit of the answer. 
Result so far: 103628.754
Subtract 2576 from 3000 to get 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Going ahead to step 12:
644 goes into 4240 6 times with a remainder of 376.
Write down 6 as next digit of the result. 
Result so far: 103628.7546
The remainder is 376 after subtracting 3864 from 4240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Let's proceed to step 13:
644 can be fit into 3760 5 times, resulting in a remainder of 540.
The next digit of our result is 5. 
Result so far: 103628.75465
If we take 3220 away from 3760, we end up with 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Going ahead to step 14:
5400 divided by 644 is 8 with a remainder of 248.
Record the quotient 8 as the next digit in the result. 
Result so far: 103628.754658
Subtracting 5152 from 5400 leaves us with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

Let's proceed to step 15:
644 goes into 2480 3 times with a remainder of 548.
Use 3 as the next digit of our solution. 
Result so far: 103628.7546583
If we take 1932 away from 2480, we end up with 548.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

Advancing to step 16:
644 can be fit into 5480 8 times, resulting in a remainder of 328.
The next digit of our result is 8. 
Result so far: 103628.75465838
Deduct 5152 from 5480 and we're left with 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

In conclusion, the division gives 103628.75465838 with a balance of 3.28e-07.