We look at the division of 223517 by 13 
The aim is to understand the frequency of 13 in 223517.

Moving on to step 1:
The number 13 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (2) from the dividend to 2 and continue with: 22 / 13

On to step 2:
22 divided by 13 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 13 from 22 leaves us with 9.
Take the next digit (3) from the dividend and append it to 9, then repeat: 93 / 13

Step 3:
When dividing 93 by 13, we get 7 with a remainder of 2.
The next digit of our result is 7. 
Result so far: 17.0
Deduct 91 from 93 and we're left with 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 13

Advancing to step 4:
13 can be fit into 25 1 times, resulting in a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 171.0
If we subtract 13 from 25, we get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 13

Going ahead to step 5:
If we divide 121 by 13, we get 9 and a remainder of 4.
Put 9 as the next digit of the answer. 
Result so far: 1719.0
If we subtract 117 from 121, we get 4.
Grab the next digit (7) from the dividend, add it to 4, then carry on: 47 / 13

Let's proceed to step 6:
13 goes into 47 3 times with a remainder of 8.
Use 3 as the next digit of our solution. 
Result so far: 17193.0
Subtracting 39 from 47 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.

Step 7:
When dividing 80 by 13, we get 6 with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 17193.6
If we take 78 away from 80, we end up 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.

Moving on to step 8:
If we divide 20 by 13, we get 1 and a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 17193.61
The remainder is 7 after subtracting 13 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 9:
13 goes into 70 5 times with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 17193.615
The remainder is 5 after subtracting 65 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
50 divided by 13 is 3 with a remainder of 11.
Put 3 as the next digit of the answer. 
Result so far: 17193.6153
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 11:
The number 13 fits into 110 8 times, leaving a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 17193.61538
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.

Advancing to step 12:
60 divided by 13 is 4 with a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 17193.615384
If we subtract 52 from 60, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 13:
80 divided by 13 is 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 17193.6153846
The remainder is 2 after subtracting 78 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 14:
The number 13 fits into 20 1 times, leaving a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 17193.61538461
The remainder is 7 after subtracting 13 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final outcome is 17193.61538461, with a leftover of 7e-09.