349935 divided by 213 
The aim is to understand the frequency of 213 in 349935.

Let's proceed to step 1:
If we divide 3 by 213, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 213

On to step 2:
213 goes into 34 0 times with a remainder of 34.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 34 and we're left with 34.
Fetch the next digit (9) from the dividend, attach it to 34 and continue: 349 / 213

Going ahead to step 3:
When dividing 349 by 213, we get 1 with a remainder of 136.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 213 away from 349, we end up with 136.
Include the next digit (9) from the dividend after 136, then repeat: 1369 / 213

Step 4:
213 goes into 1369 6 times with a remainder of 91.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we take 1278 away from 1369, we end up with 91.
Include the next digit (3) from the dividend after 91, then repeat: 913 / 213

On to step 5:
213 can be fit into 913 4 times, resulting in a remainder of 61.
The number 4 becomes the next digit in our result. 
Result so far: 164.0
The remainder is 61 after subtracting 852 from 913.
Bring next digit (5) of the dividend behind the 61 and repeat the process: 615 / 213

Going ahead to step 6:
The number 213 fits into 615 2 times, leaving a remainder of 189.
The next digit of our result is 2. 
Result so far: 1642.0
Subtracting 426 from 615 leaves us with 189.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1890, and continue the process.

Moving on to step 7:
When dividing 1890 by 213, we get 8 with a remainder of 186.
The next digit of our result is 8. 
Result so far: 1642.8
Subtracting 1704 from 1890 leaves us with 186.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1860, and continue the process.

On to step 8:
The number 213 fits into 1860 8 times, leaving a remainder of 156.
The next digit of our result is 8. 
Result so far: 1642.88
Subtracting 1704 from 1860 leaves us with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

After the division, we end up with 1642.88 and a remainder of 0.156.