Let's divide 482851 by 21
The aim is to understand the frequency of 21 in 482851.

On to step 1:
21 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (8) of the dividend behind the 4 and repeat the process: 48 / 21

Moving on to step 2:
When dividing 48 by 21, we get 2 with a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Deduct 42 from 48 and we're left with 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 21

Going ahead to step 3:
21 can be fit into 62 2 times, resulting in a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
If we subtract 42 from 62, we get 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 21

On to step 4:
21 can be fit into 208 9 times, resulting in a remainder of 19.
Use 9 as the next digit of our solution. 
Result so far: 229.0
Deduct 189 from 208 and we're left with 19.
Include the next digit (5) from the dividend after 19, then repeat: 195 / 21

Moving on to step 5:
The number 21 fits into 195 9 times, leaving a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 2299.0
The remainder is 6 after subtracting 189 from 195.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 21

Let's proceed to step 6:
21 can be fit into 61 2 times, resulting in a remainder of 19.
Record the quotient 2 as the next digit in the result. 
Result so far: 22992.0
Subtract 42 from 61 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
21 goes into 190 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 22992.9
Subtracting 189 from 190 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.

Let's proceed to step 8:
When dividing 10 by 21, we get 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 22992.9
If we take 0 away from 10, we end up 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 9:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 22992.904
Subtracting 84 from 100 leaves us 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.

Advancing to step 10:
When dividing 160 by 21, we get 7 with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 22992.9047
If we take 147 away from 160, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 11:
21 can be fit into 130 6 times, resulting in a remainder of 4.
The next digit of our result is 6. 
Result so far: 22992.90476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 12:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 22992.904761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 13:
21 goes into 190 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 22992.9047619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 14:
10 divided by 21 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 22992.9047619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 22992.9047619 with a remaining 1e-08.