63402021 divided by 9 
The aim is to understand the frequency of 9 in 63402021.

Step 1:
6 divided by 9 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 9

Going ahead to step 2:
63 divided by 9 is 7 with a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 0 after subtracting 63 from 63.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 9

On to step 3:
The number 9 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 70.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 9

Step 4:
9 goes into 40 4 times with a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 704.0
If we subtract 36 from 40, we get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 9

On to step 5:
42 divided by 9 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 7044.0
Subtract 36 from 42 to get 6.
Grab the next digit (0) from the dividend, add it to 6, then carry on: 60 / 9

Advancing to step 6:
9 goes into 60 6 times with a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 70446.0
Deduct 54 from 60 and we're left with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 9

Moving on to step 7:
9 can be fit into 62 6 times, resulting in a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 704466.0
The remainder is 8 after subtracting 54 from 62.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 9

Step 8:
If we divide 81 by 9, we get 9 and a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 7044669.0
If we subtract 81 from 81, 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.

Let's proceed to step 9:
9 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 7044669.0
The remainder is 0 after subtracting 0 from 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 10:
0 divided by 9 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 7044669.0
Deduct 0 from 0 and we're left 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.

Our division results in 7044669.0 with a remaining 0.0.