We look at the division of 64378957 by 636 
We're looking to find how many times 636 goes into 64378957.

On to step 1:
When dividing 6 by 636, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 636

Step 2:
The number 636 fits into 64 0 times, leaving a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Include the next digit (3) from the dividend after 64, then repeat: 643 / 636

Going ahead to step 3:
636 goes into 643 1 times with a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 636 from 643 and we're left with 7.
Include the next digit (7) from the dividend after 7, then repeat: 77 / 636

Moving on to step 4:
636 goes into 77 0 times with a remainder of 77.
The next digit of our result is 0. 
Result so far: 10.0
If we take 0 away from 77, we end up with 77.
Grab the next digit (8) from the dividend, add it to 77, then carry on: 778 / 636

Going ahead to step 5:
636 can be fit into 778 1 times, resulting in a remainder of 142.
The number 1 becomes the next digit in our result. 
Result so far: 101.0
Subtracting 636 from 778 leaves us with 142.
Take the next digit (9) from the dividend and append it to 142, then repeat: 1429 / 636

Step 6:
636 goes into 1429 2 times with a remainder of 157.
Use 2 as the next digit of our solution. 
Result so far: 1012.0
Subtracting 1272 from 1429 leaves us with 157.
Take the next digit (5) from the dividend and append it to 157, then repeat: 1575 / 636

Moving on to step 7:
636 can be fit into 1575 2 times, resulting in a remainder of 303.
The number 2 becomes the next digit in our result. 
Result so far: 10122.0
Deduct 1272 from 1575 and we're left with 303.
Append the next digit (7) from the dividend to 303 and continue with: 3037 / 636

Moving on to step 8:
The number 636 fits into 3037 4 times, leaving a remainder of 493.
Put 4 as the next digit of the answer. 
Result so far: 101224.0
Subtracting 2544 from 3037 leaves us with 493.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4930, and continue the process.

Moving on to step 9:
The number 636 fits into 4930 7 times, leaving a remainder of 478.
Put 7 as the next digit of the answer. 
Result so far: 101224.7
If we take 4452 away from 4930, we end up with 478.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4780, and continue the process.

Let's proceed to step 10:
636 goes into 4780 7 times with a remainder of 328.
The number 7 becomes the next digit in our result. 
Result so far: 101224.77
Subtract 4452 from 4780 to get 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Our division results in 101224.77 with a remaining 0.328.