We divide 449145 by 21
The aim is to understand the frequency of 21 in 449145.

Going ahead to step 1:
4 divided by 21 is 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Include the next digit (4) from the dividend after 4, then repeat: 44 / 21

Advancing to step 2:
When dividing 44 by 21, we get 2 with a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 42 away from 44, we end up with 2.
Take the next digit (9) from the dividend and append it to 2, then repeat: 29 / 21

Step 3:
When dividing 29 by 21, we get 1 with a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 21.0
Deduct 21 from 29 and we're left with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 21

Going ahead to step 4:
81 divided by 21 is 3 with a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 213.0
Subtract 63 from 81 to get 18.
Include the next digit (4) from the dividend after 18, then repeat: 184 / 21

On to step 5:
The number 21 fits into 184 8 times, leaving a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 2138.0
Subtract 168 from 184 to get 16.
Fetch the next digit (5) from the dividend, attach it to 16 and continue: 165 / 21

Step 6:
21 can be fit into 165 7 times, resulting in a remainder of 18.
The next digit of our result is 7. 
Result so far: 21387.0
Subtracting 147 from 165 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 7:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 21387.8
If we take 168 away from 180, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 21387.85
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 9:
21 can be fit into 150 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 21387.857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 10:
If we divide 30 by 21, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 21387.8571
Subtracting 21 from 30 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
When dividing 90 by 21, we get 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 21387.85714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 12:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The next digit of our result is 2. 
Result so far: 21387.857142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 21387.8571428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 14:
When dividing 120 by 21, we get 5 with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 21387.85714285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 21387.85714285 with a remainder of 1.5e-08.