We look at the division of 29643431 by 13 
The aim is to understand the frequency of 13 in 29643431.

Moving on to step 1:
If we divide 2 by 13, we get 0 and a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (9) from the dividend, add it to 2, then carry on: 29 / 13

Let's proceed to step 2:
13 can be fit into 29 2 times, resulting in a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 26 from 29 to get 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 13

Moving on to step 3:
If we divide 36 by 13, we get 2 and a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
Subtract 26 from 36 to get 10.
Bring next digit (4) of the dividend behind the 10 and repeat the process: 104 / 13

Let's proceed to step 4:
13 can be fit into 104 8 times, resulting in a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 228.0
If we take 104 away from 104, we end up with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 13

Moving on to step 5:
When dividing 3 by 13, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 2280.0
Subtract 0 from 3 to get 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 13

Let's proceed to step 6:
If we divide 34 by 13, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 22802.0
If we take 26 away from 34, we end up with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 13

Let's proceed to step 7:
13 goes into 83 6 times with a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 228026.0
Subtracting 78 from 83 leaves us with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 13

On to step 8:
If we divide 51 by 13, we get 3 and a remainder of 12.
The number 3 becomes the next digit in our result. 
Result so far: 2280263.0
If we subtract 39 from 51, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 9:
13 can be fit into 120 9 times, resulting in a remainder of 3.
The next digit of our result is 9. 
Result so far: 2280263.9
Deduct 117 from 120 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
When dividing 30 by 13, we get 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 2280263.92
Subtract 26 from 30 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
The number 13 fits into 40 3 times, leaving a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 2280263.923
Subtracting 39 from 40 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 12:
The number 13 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 2280263.923
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 13:
13 can be fit into 100 7 times, resulting in a remainder of 9.
Write down 7 as next digit of the result. 
Result so far: 2280263.92307
Deduct 91 from 100 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 14:
When dividing 90 by 13, we get 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 2280263.923076
Deduct 78 from 90 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 15:
When dividing 120 by 13, we get 9 with a remainder of 3.
Record the quotient 9 as the next digit in the result. 
Result so far: 2280263.9230769
The remainder is 3 after subtracting 117 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 16:
30 divided by 13 is 2 with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 2280263.92307692
The remainder is 4 after subtracting 26 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The quotient of the division is 2280263.92307692, and the remainder is 4e-09.