We divide 82312 by 21
The aim is to understand the frequency of 21 in 82312.

Let's proceed to step 1:
When dividing 8 by 21, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (2) of the dividend behind the 8 and repeat the process: 82 / 21

Step 2:
82 divided by 21 is 3 with a remainder of 19.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 63 from 82 leaves us with 19.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 21

Step 3:
21 can be fit into 193 9 times, resulting in a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 39.0
Subtracting 189 from 193 leaves us with 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 21

Let's proceed to step 4:
21 goes into 41 1 times with a remainder of 20.
Write down 1 as next digit of the result. 
Result so far: 391.0
Deduct 21 from 41 and we're left with 20.
Include the next digit (2) from the dividend after 20, then repeat: 202 / 21

On to step 5:
If we divide 202 by 21, we get 9 and a remainder of 13.
The number 9 becomes the next digit in our result. 
Result so far: 3919.0
Subtract 189 from 202 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 6:
130 divided by 21 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 3919.6
Subtract 126 from 130 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 7:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 3919.61
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 8:
21 goes into 190 9 times with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 3919.619
If we take 189 away from 190, we end up 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:
10 divided by 21 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 3919.619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
If we divide 100 by 21, we get 4 and a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 3919.61904
If we take 84 away from 100, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 11:
If we divide 160 by 21, we get 7 and a remainder of 13.
The next digit of our result is 7. 
Result so far: 3919.619047
If we subtract 147 from 160, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 12:
The number 21 fits into 130 6 times, leaving a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 3919.6190476
If we take 126 away from 130, we end up 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.

On to step 13:
21 goes into 40 1 times with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 3919.61904761
Deduct 21 from 40 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

In conclusion, the division gives 3919.61904761 with a balance of 1.9e-08.