63900906 ÷ 872 
We want to figure out the number of times 63900906 can be divided by 872.

Advancing to step 1:
When dividing 6 by 872, 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.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 872

Step 2:
If we divide 63 by 872, we get 0 and a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Append the next digit (9) from the dividend to 63 and continue with: 639 / 872

Moving on to step 3:
872 can be fit into 639 0 times, resulting in a remainder of 639.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 639 leaves us with 639.
Include the next digit (0) from the dividend after 639, then repeat: 6390 / 872

On to step 4:
6390 divided by 872 is 7 with a remainder of 286.
The next digit of our result is 7. 
Result so far: 7.0
Subtracting 6104 from 6390 leaves us with 286.
Append the next digit (0) from the dividend to 286 and continue with: 2860 / 872

On to step 5:
872 can be fit into 2860 3 times, resulting in a remainder of 244.
Put 3 as the next digit of the answer. 
Result so far: 73.0
The remainder is 244 after subtracting 2616 from 2860.
Append the next digit (9) from the dividend to 244 and continue with: 2449 / 872

Advancing to step 6:
872 goes into 2449 2 times with a remainder of 705.
Use 2 as the next digit of our solution. 
Result so far: 732.0
If we subtract 1744 from 2449, we get 705.
Fetch the next digit (0) from the dividend, attach it to 705 and continue: 7050 / 872

On to step 7:
When dividing 7050 by 872, we get 8 with a remainder of 74.
Use 8 as the next digit of our solution. 
Result so far: 7328.0
Subtracting 6976 from 7050 leaves us with 74.
Include the next digit (6) from the dividend after 74, then repeat: 746 / 872

On to step 8:
The number 872 fits into 746 0 times, leaving a remainder of 746.
Use 0 as the next digit of our solution. 
Result so far: 73280.0
Deduct 0 from 746 and we're left with 746.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7460, and continue the process.

Moving on to step 9:
The number 872 fits into 7460 8 times, leaving a remainder of 484.
The number 8 becomes the next digit in our result. 
Result so far: 73280.8
Deduct 6976 from 7460 and we're left with 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Step 10:
The number 872 fits into 4840 5 times, leaving a remainder of 480.
The next digit of our result is 5. 
Result so far: 73280.85
If we take 4360 away from 4840, we end up with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Moving on to step 11:
If we divide 4800 by 872, we get 5 and a remainder of 440.
Put 5 as the next digit of the answer. 
Result so far: 73280.855
If we subtract 4360 from 4800, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

The final outcome is 73280.855, with a leftover of 0.044.