We're dividing 12131 by 43 
The aim is to understand the frequency of 43 in 12131.

Let's proceed to step 1:
43 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 43

Step 2:
43 goes into 12 0 times with a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 12 leaves us with 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 43

On to step 3:
The number 43 fits into 121 2 times, leaving a remainder of 35.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 86 from 121 to get 35.
Take the next digit (3) from the dividend and append it to 35, then repeat: 353 / 43

On to step 4:
43 goes into 353 8 times with a remainder of 9.
Put 8 as the next digit of the answer. 
Result so far: 28.0
The remainder is 9 after subtracting 344 from 353.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 43

Let's proceed to step 5:
91 divided by 43 is 2 with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 282.0
If we take 86 away from 91, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 6:
If we divide 50 by 43, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 282.1
Deduct 43 from 50 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
70 divided by 43 is 1 with a remainder of 27.
Put 1 as the next digit of the answer. 
Result so far: 282.11
Subtract 43 from 70 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

After the division, we end up with 282.11 and a remainder of 0.027.