We're dividing 13235909 by 124 
The aim is to understand the frequency of 124 in 13235909.

On to step 1:
124 can be fit into 1 0 times, resulting in 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.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 124

Advancing to step 2:
If we divide 13 by 124, we get 0 and a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Include the next digit (2) from the dividend after 13, then repeat: 132 / 124

Going ahead to step 3:
124 goes into 132 1 times with a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 8 after subtracting 124 from 132.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 124

Step 4:
The number 124 fits into 83 0 times, leaving a remainder of 83.
Write down 0 as next digit of the result. 
Result so far: 10.0
Deduct 0 from 83 and we're left with 83.
Append the next digit (5) from the dividend to 83 and continue with: 835 / 124

On to step 5:
The number 124 fits into 835 6 times, leaving a remainder of 91.
Use 6 as the next digit of our solution. 
Result so far: 106.0
The remainder is 91 after subtracting 744 from 835.
Grab the next digit (9) from the dividend, add it to 91, then carry on: 919 / 124

Let's proceed to step 6:
919 divided by 124 is 7 with a remainder of 51.
The next digit of our result is 7. 
Result so far: 1067.0
Deduct 868 from 919 and we're left with 51.
Fetch the next digit (0) from the dividend, attach it to 51 and continue: 510 / 124

Going ahead to step 7:
When dividing 510 by 124, we get 4 with a remainder of 14.
The next digit of our result is 4. 
Result so far: 10674.0
Deduct 496 from 510 and we're left with 14.
Fetch the next digit (9) from the dividend, attach it to 14 and continue: 149 / 124

On to step 8:
124 can be fit into 149 1 times, resulting in a remainder of 25.
Record the quotient 1 as the next digit in the result. 
Result so far: 106741.0
Subtract 124 from 149 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 9:
The number 124 fits into 250 2 times, leaving a remainder of 2.
The next digit of our result is 2. 
Result so far: 106741.2
If we subtract 248 from 250, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 10:
If we divide 20 by 124, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 106741.2
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
When dividing 200 by 124, we get 1 with a remainder of 76.
The number 1 becomes the next digit in our result. 
Result so far: 106741.201
Deduct 124 from 200 and we're left with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 12:
The number 124 fits into 760 6 times, leaving a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 106741.2016
Subtract 744 from 760 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 13:
If we divide 160 by 124, we get 1 and a remainder of 36.
Record the quotient 1 as the next digit in the result. 
Result so far: 106741.20161
If we take 124 away from 160, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 14:
124 can be fit into 360 2 times, resulting in a remainder of 112.
Write down 2 as next digit of the result. 
Result so far: 106741.201612
Deduct 248 from 360 and we're left with 112.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1120, and continue the process.

On to step 15:
When dividing 1120 by 124, we get 9 with a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 106741.2016129
Deduct 1116 from 1120 and we're left 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 16:
The number 124 fits into 40 0 times, leaving a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 106741.2016129
Subtract 0 from 40 to 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.

The final outcome is 106741.2016129, with a leftover of 4e-08.