386651 divided by 13 
The aim is to understand the frequency of 13 in 386651.

Step 1:
13 goes into 3 0 times with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 13

On to step 2:
38 divided by 13 is 2 with a remainder of 12.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 26 from 38 leaves us with 12.
Fetch the next digit (6) from the dividend, attach it to 12 and continue: 126 / 13

Moving on to step 3:
13 can be fit into 126 9 times, resulting in a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Subtracting 117 from 126 leaves us with 9.
Include the next digit (6) from the dividend after 9, then repeat: 96 / 13

On to step 4:
If we divide 96 by 13, we get 7 and a remainder of 5.
Put 7 as the next digit of the answer. 
Result so far: 297.0
If we subtract 91 from 96, we get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 13

On to step 5:
13 can be fit into 55 4 times, resulting in a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 2974.0
If we subtract 52 from 55, we get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 13

Going ahead to step 6:
When dividing 31 by 13, we get 2 with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 29742.0
Subtract 26 from 31 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.

Advancing to step 7:
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: 29742.3
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.

Advancing to step 8:
If we divide 110 by 13, we get 8 and a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 29742.38
Subtract 104 from 110 to 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 9:
When dividing 60 by 13, we get 4 with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 29742.384
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.

Step 10:
The number 13 fits into 80 6 times, leaving a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 29742.3846
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.

Step 11:
If we divide 20 by 13, we get 1 and a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 29742.38461
If we take 13 away from 20, we end up 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.

Advancing to step 12:
13 goes into 70 5 times with a remainder of 5.
The next digit of our result is 5. 
Result so far: 29742.384615
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 13:
50 divided by 13 is 3 with a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 29742.3846153
Subtracting 39 from 50 leaves us 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.

Going ahead to step 14:
13 goes into 110 8 times with a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 29742.38461538
Subtract 104 from 110 to 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.

Our division results in 29742.38461538 with a remaining 6e-09.