13604987 divided by 125 
The aim is to understand the frequency of 125 in 13604987.

Let's proceed to step 1:
The number 125 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 125

Let's proceed to step 2:
13 divided by 125 is 0 with a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Append the next digit (6) from the dividend to 13 and continue with: 136 / 125

Going ahead to step 3:
If we divide 136 by 125, we get 1 and a remainder of 11.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 125 from 136 to get 11.
Include the next digit (0) from the dividend after 11, then repeat: 110 / 125

On to step 4:
If we divide 110 by 125, we get 0 and a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we subtract 0 from 110, we get 110.
Fetch the next digit (4) from the dividend, attach it to 110 and continue: 1104 / 125

Going ahead to step 5:
The number 125 fits into 1104 8 times, leaving a remainder of 104.
Use 8 as the next digit of our solution. 
Result so far: 108.0
Subtract 1000 from 1104 to get 104.
Append the next digit (9) from the dividend to 104 and continue with: 1049 / 125

Advancing to step 6:
The number 125 fits into 1049 8 times, leaving a remainder of 49.
Put 8 as the next digit of the answer. 
Result so far: 1088.0
Subtracting 1000 from 1049 leaves us with 49.
Bring next digit (8) of the dividend behind the 49 and repeat the process: 498 / 125

Advancing to step 7:
498 divided by 125 is 3 with a remainder of 123.
Write down 3 as next digit of the result. 
Result so far: 10883.0
Subtract 375 from 498 to get 123.
Fetch the next digit (7) from the dividend, attach it to 123 and continue: 1237 / 125

Going ahead to step 8:
When dividing 1237 by 125, we get 9 with a remainder of 112.
Write down 9 as next digit of the result. 
Result so far: 108839.0
Subtract 1125 from 1237 to get 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

Advancing to step 9:
125 goes into 1120 8 times with a remainder of 120.
Write down 8 as next digit of the result. 
Result so far: 108839.8
Deduct 1000 from 1120 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 10:
1200 divided by 125 is 9 with a remainder of 75.
The number 9 becomes the next digit in our result. 
Result so far: 108839.89
If we take 1125 away from 1200, we end up with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 11:
The number 125 fits into 750 6 times, leaving a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 108839.896
The remainder is 0 after subtracting 750 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 12:
If we divide 0 by 125, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 108839.896
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 13:
The number 125 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 108839.896
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 108839.896 with a remainder of 0.0.