123712 ÷ 43 
The aim is to understand the frequency of 43 in 123712.

On to step 1:
43 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 43

Going ahead to step 2:
When dividing 12 by 43, we get 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Fetch the next digit (3) from the dividend, attach it to 12 and continue: 123 / 43

On to step 3:
The number 43 fits into 123 2 times, leaving a remainder of 37.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 86 from 123, we get 37.
Include the next digit (7) from the dividend after 37, then repeat: 377 / 43

On to step 4:
The number 43 fits into 377 8 times, leaving a remainder of 33.
The number 8 becomes the next digit in our result. 
Result so far: 28.0
If we take 344 away from 377, we end up with 33.
Include the next digit (1) from the dividend after 33, then repeat: 331 / 43

On to step 5:
If we divide 331 by 43, we get 7 and a remainder of 30.
Write down 7 as next digit of the result. 
Result so far: 287.0
If we take 301 away from 331, we end up with 30.
Grab the next digit (2) from the dividend, add it to 30, then carry on: 302 / 43

Step 6:
43 goes into 302 7 times with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 2877.0
Deduct 301 from 302 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
43 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 2877.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
43 can be fit into 100 2 times, resulting in a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 2877.02
Subtract 86 from 100 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 9:
If we divide 140 by 43, we get 3 and a remainder of 11.
The next digit of our result is 3. 
Result so far: 2877.023
If we subtract 129 from 140, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 10:
43 can be fit into 110 2 times, resulting in a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 2877.0232
The remainder is 24 after subtracting 86 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 11:
43 can be fit into 240 5 times, resulting in a remainder of 25.
The next digit of our result is 5. 
Result so far: 2877.02325
The remainder is 25 after subtracting 215 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 12:
If we divide 250 by 43, we get 5 and a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 2877.023255
The remainder is 35 after subtracting 215 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final result is 2877.023255 with a remainder of 3.5e-06.