Let's divide 88512404 by 129
The aim is to understand the frequency of 129 in 88512404.

Moving on to step 1:
If we divide 8 by 129, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (8) from the dividend and append it to 8, then repeat: 88 / 129

Moving on to step 2:
When dividing 88 by 129, we get 0 with a remainder of 88.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 88, we get 88.
Fetch the next digit (5) from the dividend, attach it to 88 and continue: 885 / 129

On to step 3:
If we divide 885 by 129, we get 6 and a remainder of 111.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we take 774 away from 885, we end up with 111.
Fetch the next digit (1) from the dividend, attach it to 111 and continue: 1111 / 129

On to step 4:
1111 divided by 129 is 8 with a remainder of 79.
Put 8 as the next digit of the answer. 
Result so far: 68.0
Subtracting 1032 from 1111 leaves us with 79.
Grab the next digit (2) from the dividend, add it to 79, then carry on: 792 / 129

Step 5:
If we divide 792 by 129, we get 6 and a remainder of 18.
The number 6 becomes the next digit in our result. 
Result so far: 686.0
If we take 774 away from 792, we end up with 18.
Append the next digit (4) from the dividend to 18 and continue with: 184 / 129

Moving on to step 6:
When dividing 184 by 129, we get 1 with a remainder of 55.
Write down 1 as next digit of the result. 
Result so far: 6861.0
Subtracting 129 from 184 leaves us with 55.
Grab the next digit (0) from the dividend, add it to 55, then carry on: 550 / 129

On to step 7:
When dividing 550 by 129, we get 4 with a remainder of 34.
The next digit of our result is 4. 
Result so far: 68614.0
The remainder is 34 after subtracting 516 from 550.
Grab the next digit (4) from the dividend, add it to 34, then carry on: 344 / 129

Let's proceed to step 8:
129 goes into 344 2 times with a remainder of 86.
Record the quotient 2 as the next digit in the result. 
Result so far: 686142.0
Subtracting 258 from 344 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Step 9:
If we divide 860 by 129, we get 6 and a remainder of 86.
Put 6 as the next digit of the answer. 
Result so far: 686142.6
Subtract 774 from 860 to get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Going ahead to step 10:
129 can be fit into 860 6 times, resulting in a remainder of 86.
Use 6 as the next digit of our solution. 
Result so far: 686142.66
If we subtract 774 from 860, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Our division results in 686142.66 with a remaining 0.086.