We look at the division of 63896854 by 129 
We want to figure out the number of times 63896854 can be divided by 129.

Going ahead to step 1:
The number 129 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 129

Advancing to step 2:
If we divide 63 by 129, we get 0 and a remainder of 63.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Include the next digit (8) from the dividend after 63, then repeat: 638 / 129

Moving on to step 3:
The number 129 fits into 638 4 times, leaving a remainder of 122.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 516 away from 638, we end up with 122.
Include the next digit (9) from the dividend after 122, then repeat: 1229 / 129

Let's proceed to step 4:
129 can be fit into 1229 9 times, resulting in a remainder of 68.
Record the quotient 9 as the next digit in the result. 
Result so far: 49.0
If we take 1161 away from 1229, we end up with 68.
Take the next digit (6) from the dividend and append it to 68, then repeat: 686 / 129

Advancing to step 5:
686 divided by 129 is 5 with a remainder of 41.
Write down 5 as next digit of the result. 
Result so far: 495.0
If we subtract 645 from 686, we get 41.
Include the next digit (8) from the dividend after 41, then repeat: 418 / 129

Advancing to step 6:
418 divided by 129 is 3 with a remainder of 31.
Record the quotient 3 as the next digit in the result. 
Result so far: 4953.0
If we subtract 387 from 418, we get 31.
Append the next digit (5) from the dividend to 31 and continue with: 315 / 129

Step 7:
If we divide 315 by 129, we get 2 and a remainder of 57.
Write down 2 as next digit of the result. 
Result so far: 49532.0
The remainder is 57 after subtracting 258 from 315.
Bring next digit (4) of the dividend behind the 57 and repeat the process: 574 / 129

On to step 8:
The number 129 fits into 574 4 times, leaving a remainder of 58.
The next digit of our result is 4. 
Result so far: 495324.0
Subtract 516 from 574 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 9:
The number 129 fits into 580 4 times, leaving a remainder of 64.
Put 4 as the next digit of the answer. 
Result so far: 495324.4
If we take 516 away from 580, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 10:
129 goes into 640 4 times with a remainder of 124.
Use 4 as the next digit of our solution. 
Result so far: 495324.44
Subtract 516 from 640 to get 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

The final outcome is 495324.44, with a leftover of 0.124.