Let's divide 13861497 by 129
The aim is to understand the frequency of 129 in 13861497.

Let's proceed to step 1:
When dividing 1 by 129, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 129

Advancing to step 2:
13 divided by 129 is 0 with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 13, we get 13.
Grab the next digit (8) from the dividend, add it to 13, then carry on: 138 / 129

Going ahead to step 3:
138 divided by 129 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 129 from 138 and we're left with 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 129

On to step 4:
The number 129 fits into 96 0 times, leaving a remainder of 96.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Deduct 0 from 96 and we're left with 96.
Bring next digit (1) of the dividend behind the 96 and repeat the process: 961 / 129

Moving on to step 5:
If we divide 961 by 129, we get 7 and a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 107.0
Subtracting 903 from 961 leaves us with 58.
Take the next digit (4) from the dividend and append it to 58, then repeat: 584 / 129

Moving on to step 6:
129 can be fit into 584 4 times, resulting in a remainder of 68.
The number 4 becomes the next digit in our result. 
Result so far: 1074.0
If we take 516 away from 584, we end up with 68.
Bring next digit (9) of the dividend behind the 68 and repeat the process: 689 / 129

Moving on to step 7:
When dividing 689 by 129, we get 5 with a remainder of 44.
Use 5 as the next digit of our solution. 
Result so far: 10745.0
The remainder is 44 after subtracting 645 from 689.
Bring next digit (7) of the dividend behind the 44 and repeat the process: 447 / 129

Advancing to step 8:
When dividing 447 by 129, we get 3 with a remainder of 60.
Record the quotient 3 as the next digit in the result. 
Result so far: 107453.0
The remainder is 60 after subtracting 387 from 447.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
The number 129 fits into 600 4 times, leaving a remainder of 84.
The next digit of our result is 4. 
Result so far: 107453.4
Deduct 516 from 600 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Moving on to step 10:
129 can be fit into 840 6 times, resulting in a remainder of 66.
Write down 6 as next digit of the result. 
Result so far: 107453.46
If we subtract 774 from 840, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 11:
The number 129 fits into 660 5 times, leaving a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 107453.465
Deduct 645 from 660 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 12:
The number 129 fits into 150 1 times, leaving a remainder of 21.
The number 1 becomes the next digit in our result. 
Result so far: 107453.4651
Subtract 129 from 150 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 13:
129 can be fit into 210 1 times, resulting in a remainder of 81.
Record the quotient 1 as the next digit in the result. 
Result so far: 107453.46511
The remainder is 81 after subtracting 129 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

The final result is 107453.46511 with a remainder of 8.1e-05.