We look at the division of 444274 by 21 
The aim is to understand the frequency of 21 in 444274.

Step 1:
When dividing 4 by 21, we get 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (4) from the dividend and append it to 4, then repeat: 44 / 21

Step 2:
The number 21 fits into 44 2 times, leaving a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we subtract 42 from 44, we get 2.
Append the next digit (4) from the dividend to 2 and continue with: 24 / 21

Advancing to step 3:
When dividing 24 by 21, we get 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 21.0
If we take 21 away from 24, we end up with 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 21

On to step 4:
21 can be fit into 32 1 times, resulting in a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 211.0
Deduct 21 from 32 and we're left with 11.
Bring next digit (7) of the dividend behind the 11 and repeat the process: 117 / 21

Going ahead to step 5:
The number 21 fits into 117 5 times, leaving a remainder of 12.
Write down 5 as next digit of the result. 
Result so far: 2115.0
If we subtract 105 from 117, we get 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 21

Going ahead to step 6:
21 goes into 124 5 times with a remainder of 19.
Use 5 as the next digit of our solution. 
Result so far: 21155.0
The remainder is 19 after subtracting 105 from 124.
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 7:
When dividing 190 by 21, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 21155.9
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 8:
When dividing 10 by 21, we get 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 21155.9
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.

On to step 9:
When dividing 100 by 21, we get 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 21155.904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 10:
160 divided by 21 is 7 with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 21155.9047
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.

Let's proceed to step 11:
21 goes into 130 6 times with a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 21155.90476
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.

On to step 12:
40 divided by 21 is 1 with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 21155.904761
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.

Moving on to step 13:
21 can be fit into 190 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 21155.9047619
Deduct 189 from 190 and we're left 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.

Advancing to step 14:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 21155.9047619
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.

Our division results in 21155.9047619 with a remaining 1e-08.