Let's divide 428109 by 13
The aim is to understand the frequency of 13 in 428109.

Moving on to step 1:
The number 13 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 13

Let's proceed to step 2:
13 goes into 42 3 times with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 39 away from 42, we end up with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 13

Step 3:
The number 13 fits into 38 2 times, leaving a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Subtracting 26 from 38 leaves us with 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 13

Going ahead to step 4:
13 goes into 121 9 times with a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 329.0
Subtracting 117 from 121 leaves us with 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 13

Let's proceed to step 5:
If we divide 40 by 13, we get 3 and a remainder of 1.
The next digit of our result is 3. 
Result so far: 3293.0
Deduct 39 from 40 and we're left with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 13

On to step 6:
If we divide 19 by 13, we get 1 and a remainder of 6.
The next digit of our result is 1. 
Result so far: 32931.0
Deduct 13 from 19 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
60 divided by 13 is 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 32931.4
Subtracting 52 from 60 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 8:
80 divided by 13 is 6 with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 32931.46
If we subtract 78 from 80, 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.

Step 9:
20 divided by 13 is 1 with a remainder of 7.
The next digit of our result is 1. 
Result so far: 32931.461
Deduct 13 from 20 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.

Let's proceed to step 10:
The number 13 fits into 70 5 times, leaving a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 32931.4615
Subtract 65 from 70 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 11:
When dividing 50 by 13, we get 3 with a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 32931.46153
The remainder is 11 after subtracting 39 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 12:
The number 13 fits into 110 8 times, leaving a remainder of 6.
The next digit of our result is 8. 
Result so far: 32931.461538
The remainder is 6 after subtracting 104 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 13:
The number 13 fits into 60 4 times, leaving a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 32931.4615384
The remainder is 8 after subtracting 52 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
13 can be fit into 80 6 times, resulting in a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 32931.46153846
Deduct 78 from 80 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 32931.46153846, with a leftover of 2e-09.