Let's divide 18729690 by 13
The aim is to understand the frequency of 13 in 18729690.

On to step 1:
If we divide 1 by 13, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 13

Going ahead to step 2:
If we divide 18 by 13, we get 1 and a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 5 after subtracting 13 from 18.
Append the next digit (7) from the dividend to 5 and continue with: 57 / 13

Going ahead to step 3:
The number 13 fits into 57 4 times, leaving a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 14.0
If we take 52 away from 57, we end up with 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 13

Moving on to step 4:
52 divided by 13 is 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 144.0
Deduct 52 from 52 and we're left with 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 13

Advancing to step 5:
13 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 1440.0
If we subtract 0 from 9, we get 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 13

Going ahead to step 6:
96 divided by 13 is 7 with a remainder of 5.
Put 7 as the next digit of the answer. 
Result so far: 14407.0
The remainder is 5 after subtracting 91 from 96.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 13

Let's proceed to step 7:
13 can be fit into 59 4 times, resulting in a remainder of 7.
The next digit of our result is 4. 
Result so far: 144074.0
Deduct 52 from 59 and we're left with 7.
Bring next digit (0) of the dividend behind the 7 and repeat the process: 70 / 13

Advancing to step 8:
13 goes into 70 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 1440745.0
If we subtract 65 from 70, we 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 9:
13 can be fit into 50 3 times, resulting in a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 1440745.3
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.

Step 10:
The number 13 fits into 110 8 times, leaving a remainder of 6.
The next digit of our result is 8. 
Result so far: 1440745.38
If we take 104 away from 110, we end up 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.

Moving on to step 11:
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: 1440745.384
Deduct 52 from 60 and we're left 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.

On to step 12:
13 goes into 80 6 times with a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 1440745.3846
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.

Let's proceed to step 13:
20 divided by 13 is 1 with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 1440745.38461
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.

Moving on to step 14:
13 goes into 70 5 times with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 1440745.384615
Subtracting 65 from 70 leaves us 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.

Advancing to step 15:
50 divided by 13 is 3 with a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 1440745.3846153
Deduct 39 from 50 and we're left 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.

Step 16:
If we divide 110 by 13, we get 8 and a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 1440745.38461538
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.

After the division, we end up with 1440745.38461538 and a remainder of 6e-09.