329393 divided by 21 
The aim is to understand the frequency of 21 in 329393.

Step 1:
The number 21 fits into 3 0 times, leaving 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.
Fetch the next digit (2) from the dividend, attach it to 3 and continue: 32 / 21

Advancing to step 2:
32 divided by 21 is 1 with a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 21 from 32 and we're left with 11.
Append the next digit (9) from the dividend to 11 and continue with: 119 / 21

Let's proceed to step 3:
When dividing 119 by 21, we get 5 with a remainder of 14.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
The remainder is 14 after subtracting 105 from 119.
Bring next digit (3) of the dividend behind the 14 and repeat the process: 143 / 21

Going ahead to step 4:
21 goes into 143 6 times with a remainder of 17.
Write down 6 as next digit of the result. 
Result so far: 156.0
The remainder is 17 after subtracting 126 from 143.
Append the next digit (9) from the dividend to 17 and continue with: 179 / 21

Let's proceed to step 5:
When dividing 179 by 21, we get 8 with a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 1568.0
Subtracting 168 from 179 leaves us with 11.
Append the next digit (3) from the dividend to 11 and continue with: 113 / 21

Step 6:
The number 21 fits into 113 5 times, leaving a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 15685.0
If we subtract 105 from 113, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 7:
21 goes into 80 3 times with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 15685.3
If we take 63 away from 80, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 8:
21 goes into 170 8 times with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 15685.38
The remainder is 2 after subtracting 168 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 9:
The number 21 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 15685.38
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 10:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 15685.3809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 11:
When dividing 110 by 21, we get 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 15685.38095
Subtract 105 from 110 to 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.

On to step 12:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 15685.380952
Subtract 42 from 50 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 13:
21 can be fit into 80 3 times, resulting in a remainder of 17.
The next digit of our result is 3. 
Result so far: 15685.3809523
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 15685.38095238
If we take 168 away from 170, we end up 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.

The quotient of the division is 15685.38095238, and the remainder is 2e-09.