We look at the division of 125875 by 87 
The aim is to understand the frequency of 87 in 125875.

Step 1:
1 divided by 87 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 87

Advancing to step 2:
87 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (5) from the dividend to 12 and continue with: 125 / 87

Let's proceed to step 3:
If we divide 125 by 87, we get 1 and a remainder of 38.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 87 from 125 to get 38.
Bring next digit (8) of the dividend behind the 38 and repeat the process: 388 / 87

Let's proceed to step 4:
388 divided by 87 is 4 with a remainder of 40.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Subtracting 348 from 388 leaves us with 40.
Append the next digit (7) from the dividend to 40 and continue with: 407 / 87

Going ahead to step 5:
When dividing 407 by 87, we get 4 with a remainder of 59.
Use 4 as the next digit of our solution. 
Result so far: 144.0
If we take 348 away from 407, we end up with 59.
Include the next digit (5) from the dividend after 59, then repeat: 595 / 87

Moving on to step 6:
595 divided by 87 is 6 with a remainder of 73.
Put 6 as the next digit of the answer. 
Result so far: 1446.0
Subtracting 522 from 595 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Step 7:
730 divided by 87 is 8 with a remainder of 34.
The number 8 becomes the next digit in our result. 
Result so far: 1446.8
Subtracting 696 from 730 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Let's proceed to step 8:
87 goes into 340 3 times with a remainder of 79.
The number 3 becomes the next digit in our result. 
Result so far: 1446.83
Subtract 261 from 340 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Step 9:
790 divided by 87 is 9 with a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 1446.839
If we subtract 783 from 790, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 10:
87 can be fit into 70 0 times, resulting in a remainder of 70.
The next digit of our result is 0. 
Result so far: 1446.839
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 11:
If we divide 700 by 87, we get 8 and a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 1446.83908
If we take 696 away from 700, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
87 goes into 40 0 times with a remainder of 40.
The next digit of our result is 0. 
Result so far: 1446.83908
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 13:
87 goes into 400 4 times with a remainder of 52.
The next digit of our result is 4. 
Result so far: 1446.8390804
Subtracting 348 from 400 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 14:
The number 87 fits into 520 5 times, leaving a remainder of 85.
Record the quotient 5 as the next digit in the result. 
Result so far: 1446.83908045
If we subtract 435 from 520, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

The final outcome is 1446.83908045, with a leftover of 8.5e-08.