544307 divided by 21 
The aim is to understand the frequency of 21 in 544307.

Going ahead to step 1:
The number 21 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 21

Moving on to step 2:
When dividing 54 by 21, we get 2 with a remainder of 12.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 42 from 54 and we're left with 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 21

On to step 3:
When dividing 124 by 21, we get 5 with a remainder of 19.
The next digit of our result is 5. 
Result so far: 25.0
If we take 105 away from 124, we end up with 19.
Include the next digit (3) from the dividend after 19, then repeat: 193 / 21

Step 4:
The number 21 fits into 193 9 times, leaving a remainder of 4.
Write down 9 as next digit of the result. 
Result so far: 259.0
The remainder is 4 after subtracting 189 from 193.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 21

Let's proceed to step 5:
40 divided by 21 is 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 2591.0
If we take 21 away from 40, we end up with 19.
Include the next digit (7) from the dividend after 19, then repeat: 197 / 21

Going ahead to step 6:
When dividing 197 by 21, we get 9 with a remainder of 8.
The next digit of our result is 9. 
Result so far: 25919.0
The remainder is 8 after subtracting 189 from 197.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 7:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 25919.3
If we take 63 away from 80, we end up with 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 8:
21 can be fit into 170 8 times, resulting in a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 25919.38
Deduct 168 from 170 and we're left 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.

Advancing to step 9:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 25919.38
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
When dividing 200 by 21, we get 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 25919.3809
Subtracting 189 from 200 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 11:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 25919.38095
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.

Let's proceed to step 12:
21 goes into 50 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 25919.380952
If we subtract 42 from 50, we 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.

On to step 13:
If we divide 80 by 21, we get 3 and a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 25919.3809523
Subtracting 63 from 80 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 14:
If we divide 170 by 21, we get 8 and a remainder of 2.
The next digit of our result is 8. 
Result so far: 25919.38095238
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.

The quotient of the division is 25919.38095238, and the remainder is 2e-09.