873555 divided by 13 
The aim is to understand the frequency of 13 in 873555.

Let's proceed to step 1:
The number 13 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 13

On to step 2:
The number 13 fits into 87 6 times, leaving a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Deduct 78 from 87 and we're left with 9.
Include the next digit (3) from the dividend after 9, then repeat: 93 / 13

Advancing to step 3:
If we divide 93 by 13, we get 7 and a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 67.0
If we subtract 91 from 93, we get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 13

Step 4:
The number 13 fits into 25 1 times, leaving a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 671.0
If we subtract 13 from 25, we get 12.
Include the next digit (5) from the dividend after 12, then repeat: 125 / 13

Going ahead to step 5:
When dividing 125 by 13, we get 9 with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 6719.0
If we take 117 away from 125, we end up with 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 13

Step 6:
13 can be fit into 85 6 times, resulting in a remainder of 7.
The number 6 becomes the next digit in our result. 
Result so far: 67196.0
Subtract 78 from 85 to get 7.
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 7:
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: 67196.5
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.

Moving on to step 8:
13 goes into 50 3 times with a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 67196.53
If we take 39 away from 50, we end up with 11.
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 9:
When dividing 110 by 13, we get 8 with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 67196.538
If we subtract 104 from 110, we get 6.
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 10:
If we divide 60 by 13, we get 4 and a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 67196.5384
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.

Going ahead to step 11:
13 can be fit into 80 6 times, resulting in a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 67196.53846
Subtracting 78 from 80 leaves us 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.

Step 12:
When dividing 20 by 13, we get 1 with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 67196.538461
Subtract 13 from 20 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 13:
70 divided by 13 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 67196.5384615
Deduct 65 from 70 and we're left 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 14:
The number 13 fits into 50 3 times, leaving a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 67196.53846153
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.

After the division, we end up with 67196.53846153 and a remainder of 1.1e-08.