444465 ÷ 21 
The aim is to understand the frequency of 21 in 444465.

Advancing to step 1:
If we divide 4 by 21, we get 0 and a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (4) from the dividend to 4 and continue with: 44 / 21

On to step 2:
21 can be fit into 44 2 times, resulting in a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 2 after subtracting 42 from 44.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 21

Let's proceed to step 3:
The number 21 fits into 24 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Subtracting 21 from 24 leaves us with 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 21

Going ahead to step 4:
21 goes into 34 1 times with a remainder of 13.
The next digit of our result is 1. 
Result so far: 211.0
Deduct 21 from 34 and we're left with 13.
Include the next digit (6) from the dividend after 13, then repeat: 136 / 21

Advancing to step 5:
21 can be fit into 136 6 times, resulting in a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 2116.0
If we take 126 away from 136, we end up with 10.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 21

Going ahead to step 6:
21 can be fit into 105 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 21165.0
Subtracting 105 from 105 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
The number 21 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 21165.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
21 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 21165.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 21165.0 and a remainder of 0.0.