Let's divide 350821 by 13
The aim is to understand the frequency of 13 in 350821.

Moving on to step 1:
13 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 13

Moving on to step 2:
35 divided by 13 is 2 with a remainder of 9.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 26 from 35 to get 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 13

Going ahead to step 3:
13 goes into 90 6 times with a remainder of 12.
Use 6 as the next digit of our solution. 
Result so far: 26.0
If we subtract 78 from 90, we get 12.
Grab the next digit (8) from the dividend, add it to 12, then carry on: 128 / 13

Moving on to step 4:
If we divide 128 by 13, we get 9 and a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 269.0
If we subtract 117 from 128, we get 11.
Take the next digit (2) from the dividend and append it to 11, then repeat: 112 / 13

Step 5:
When dividing 112 by 13, we get 8 with a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 2698.0
If we take 104 away from 112, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 13

Moving on to step 6:
13 goes into 81 6 times with a remainder of 3.
The next digit of our result is 6. 
Result so far: 26986.0
If we take 78 away from 81, 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.

On to step 7:
When dividing 30 by 13, we get 2 with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 26986.2
If we subtract 26 from 30, we 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.

Let's proceed to step 8:
13 goes into 40 3 times with a remainder of 1.
The next digit of our result is 3. 
Result so far: 26986.23
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.

Going ahead to step 9:
The number 13 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 26986.23
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.

Moving on to step 10:
If we divide 100 by 13, we get 7 and a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 26986.2307
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 11:
13 can be fit into 90 6 times, resulting in a remainder of 12.
The next digit of our result is 6. 
Result so far: 26986.23076
If we take 78 away from 90, we end up 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.

Advancing to step 12:
When dividing 120 by 13, we get 9 with a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 26986.230769
Subtract 117 from 120 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 13:
30 divided by 13 is 2 with a remainder of 4.
The number 2 becomes the next digit in our result. 
Result so far: 26986.2307692
Deduct 26 from 30 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 14:
If we divide 40 by 13, we get 3 and a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 26986.23076923
Deduct 39 from 40 and we're left 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.

After the division, we end up with 26986.23076923 and a remainder of 1e-09.