57172013 ÷ 129 
The aim is to understand the frequency of 129 in 57172013.

Step 1:
129 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 129

Going ahead to step 2:
129 can be fit into 57 0 times, resulting in a remainder of 57.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 57 after subtracting 0 from 57.
Grab the next digit (1) from the dividend, add it to 57, then carry on: 571 / 129

Let's proceed to step 3:
571 divided by 129 is 4 with a remainder of 55.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 516 away from 571, we end up with 55.
Append the next digit (7) from the dividend to 55 and continue with: 557 / 129

Going ahead to step 4:
The number 129 fits into 557 4 times, leaving a remainder of 41.
Use 4 as the next digit of our solution. 
Result so far: 44.0
Subtracting 516 from 557 leaves us with 41.
Grab the next digit (2) from the dividend, add it to 41, then carry on: 412 / 129

Going ahead to step 5:
412 divided by 129 is 3 with a remainder of 25.
Record the quotient 3 as the next digit in the result. 
Result so far: 443.0
Subtracting 387 from 412 leaves us with 25.
Fetch the next digit (0) from the dividend, attach it to 25 and continue: 250 / 129

Going ahead to step 6:
129 goes into 250 1 times with a remainder of 121.
The number 1 becomes the next digit in our result. 
Result so far: 4431.0
If we subtract 129 from 250, we get 121.
Fetch the next digit (1) from the dividend, attach it to 121 and continue: 1211 / 129

Moving on to step 7:
If we divide 1211 by 129, we get 9 and a remainder of 50.
Write down 9 as next digit of the result. 
Result so far: 44319.0
The remainder is 50 after subtracting 1161 from 1211.
Bring next digit (3) of the dividend behind the 50 and repeat the process: 503 / 129

Advancing to step 8:
If we divide 503 by 129, we get 3 and a remainder of 116.
The next digit of our result is 3. 
Result so far: 443193.0
Deduct 387 from 503 and we're left with 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

On to step 9:
The number 129 fits into 1160 8 times, leaving a remainder of 128.
Record the quotient 8 as the next digit in the result. 
Result so far: 443193.8
If we subtract 1032 from 1160, we get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 10:
129 can be fit into 1280 9 times, resulting in a remainder of 119.
The number 9 becomes the next digit in our result. 
Result so far: 443193.89
The remainder is 119 after subtracting 1161 from 1280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

Advancing to step 11:
129 goes into 1190 9 times with a remainder of 29.
Put 9 as the next digit of the answer. 
Result so far: 443193.899
If we subtract 1161 from 1190, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 443193.899 with a remainder of 0.0029.