733304 divided by 21 
The aim is to understand the frequency of 21 in 733304.

Going ahead to step 1:
21 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 21

Going ahead to step 2:
When dividing 73 by 21, we get 3 with a remainder of 10.
The next digit of our result is 3. 
Result so far: 3.0
The remainder is 10 after subtracting 63 from 73.
Include the next digit (3) from the dividend after 10, then repeat: 103 / 21

Going ahead to step 3:
The number 21 fits into 103 4 times, leaving a remainder of 19.
Record the quotient 4 as the next digit in the result. 
Result so far: 34.0
Subtract 84 from 103 to get 19.
Grab the next digit (3) from the dividend, add it to 19, then carry on: 193 / 21

On to step 4:
When dividing 193 by 21, we get 9 with a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 349.0
If we subtract 189 from 193, we get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 21

Advancing to step 5:
21 goes into 40 1 times with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 3491.0
The remainder is 19 after subtracting 21 from 40.
Bring next digit (4) of the dividend behind the 19 and repeat the process: 194 / 21

Let's proceed to step 6:
If we divide 194 by 21, we get 9 and a remainder of 5.
The number 9 becomes the next digit in our result. 
Result so far: 34919.0
If we subtract 189 from 194, we 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.

Advancing to step 7:
21 goes into 50 2 times with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 34919.2
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.

Advancing to step 8:
80 divided by 21 is 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 34919.23
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 9:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 34919.238
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.

Moving on to step 10:
If we divide 20 by 21, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 34919.238
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
The number 21 fits into 200 9 times, leaving a remainder of 11.
The next digit of our result is 9. 
Result so far: 34919.23809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 12:
If we divide 110 by 21, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 34919.238095
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 13:
The number 21 fits into 50 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 34919.2380952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 14:
If we divide 80 by 21, we get 3 and a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 34919.23809523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Our division results in 34919.23809523 with a remaining 1.7e-08.