42845729 divided by 13 
The aim is to understand the frequency of 13 in 42845729.

On to step 1:
If we divide 4 by 13, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 13

Advancing to step 2:
The number 13 fits into 42 3 times, leaving a remainder of 3.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 39 from 42 leaves us with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 13

Moving on to step 3:
When dividing 38 by 13, we get 2 with a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Subtracting 26 from 38 leaves us with 12.
Include the next digit (4) from the dividend after 12, then repeat: 124 / 13

On to step 4:
If we divide 124 by 13, we get 9 and a remainder of 7.
Record the quotient 9 as the next digit in the result. 
Result so far: 329.0
The remainder is 7 after subtracting 117 from 124.
Include the next digit (5) from the dividend after 7, then repeat: 75 / 13

Advancing to step 5:
The number 13 fits into 75 5 times, leaving a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 3295.0
The remainder is 10 after subtracting 65 from 75.
Append the next digit (7) from the dividend to 10 and continue with: 107 / 13

Let's proceed to step 6:
The number 13 fits into 107 8 times, leaving a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 32958.0
If we take 104 away from 107, we end up with 3.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 13

Moving on to step 7:
The number 13 fits into 32 2 times, leaving a remainder of 6.
The next digit of our result is 2. 
Result so far: 329582.0
Subtracting 26 from 32 leaves us with 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 13

On to step 8:
13 can be fit into 69 5 times, resulting in a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 3295825.0
Subtract 65 from 69 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.

On to step 9:
13 goes into 40 3 times with a remainder of 1.
The next digit of our result is 3. 
Result so far: 3295825.3
The remainder is 1 after subtracting 39 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 10:
The number 13 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 3295825.3
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 11:
13 goes into 100 7 times with a remainder of 9.
The next digit of our result is 7. 
Result so far: 3295825.307
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.

Let's proceed to step 12:
90 divided by 13 is 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 3295825.3076
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.

Step 13:
13 goes into 120 9 times with a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 3295825.30769
If we take 117 away from 120, we end up 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 14:
When dividing 30 by 13, we get 2 with a remainder of 4.
The next digit of our result is 2. 
Result so far: 3295825.307692
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.

Advancing to step 15:
13 can be fit into 40 3 times, resulting in a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 3295825.3076923
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 16:
13 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 3295825.3076923
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 3295825.3076923, with a leftover of 1e-08.