15913136 ÷ 129 
We want to figure out the number of times 15913136 can be divided by 129.

On to step 1:
The number 129 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 129

Step 2:
15 divided by 129 is 0 with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 129

Going ahead to step 3:
129 goes into 159 1 times with a remainder of 30.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 30 after subtracting 129 from 159.
Bring next digit (1) of the dividend behind the 30 and repeat the process: 301 / 129

Let's proceed to step 4:
301 divided by 129 is 2 with a remainder of 43.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 258 from 301 leaves us with 43.
Append the next digit (3) from the dividend to 43 and continue with: 433 / 129

Step 5:
129 goes into 433 3 times with a remainder of 46.
The next digit of our result is 3. 
Result so far: 123.0
Subtract 387 from 433 to get 46.
Bring next digit (1) of the dividend behind the 46 and repeat the process: 461 / 129

Step 6:
When dividing 461 by 129, we get 3 with a remainder of 74.
Write down 3 as next digit of the result. 
Result so far: 1233.0
Subtract 387 from 461 to get 74.
Grab the next digit (3) from the dividend, add it to 74, then carry on: 743 / 129

Going ahead to step 7:
The number 129 fits into 743 5 times, leaving a remainder of 98.
Record the quotient 5 as the next digit in the result. 
Result so far: 12335.0
Subtracting 645 from 743 leaves us with 98.
Fetch the next digit (6) from the dividend, attach it to 98 and continue: 986 / 129

Let's proceed to step 8:
The number 129 fits into 986 7 times, leaving a remainder of 83.
The number 7 becomes the next digit in our result. 
Result so far: 123357.0
If we subtract 903 from 986, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Advancing to step 9:
If we divide 830 by 129, we get 6 and a remainder of 56.
Use 6 as the next digit of our solution. 
Result so far: 123357.6
The remainder is 56 after subtracting 774 from 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 10:
129 can be fit into 560 4 times, resulting in a remainder of 44.
Write down 4 as next digit of the result. 
Result so far: 123357.64
If we subtract 516 from 560, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 11:
440 divided by 129 is 3 with a remainder of 53.
The number 3 becomes the next digit in our result. 
Result so far: 123357.643
If we take 387 away from 440, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Moving on to step 12:
If we divide 530 by 129, we get 4 and a remainder of 14.
The next digit of our result is 4. 
Result so far: 123357.6434
Subtract 516 from 530 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
129 can be fit into 140 1 times, resulting in a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 123357.64341
The remainder is 11 after subtracting 129 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 14:
When dividing 110 by 129, we get 0 with a remainder of 110.
Use 0 as the next digit of our solution. 
Result so far: 123357.64341
Deduct 0 from 110 and we're left with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Let's proceed to step 15:
129 goes into 1100 8 times with a remainder of 68.
The number 8 becomes the next digit in our result. 
Result so far: 123357.6434108
Subtracting 1032 from 1100 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Step 16:
129 can be fit into 680 5 times, resulting in a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 123357.64341085
Subtracting 645 from 680 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final outcome is 123357.64341085, with a leftover of 3.5e-08.