Let's divide 551580 by 9
The aim is to understand the frequency of 9 in 551580.

Step 1:
The number 9 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 9

Let's proceed to step 2:
If we divide 55 by 9, we get 6 and a remainder of 1.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 54 from 55 leaves us with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 9

Advancing to step 3:
The number 9 fits into 11 1 times, leaving a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 61.0
If we subtract 9 from 11, we get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 9

Step 4:
If we divide 25 by 9, we get 2 and a remainder of 7.
The next digit of our result is 2. 
Result so far: 612.0
Deduct 18 from 25 and we're left with 7.
Append the next digit (8) from the dividend to 7 and continue with: 78 / 9

Step 5:
The number 9 fits into 78 8 times, leaving a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 6128.0
If we take 72 away from 78, we end up with 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 9

On to step 6:
60 divided by 9 is 6 with a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 61286.0
Subtracting 54 from 60 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
The number 9 fits into 60 6 times, leaving a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 61286.6
If we subtract 54 from 60, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
9 can be fit into 60 6 times, resulting in a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 61286.66
Subtract 54 from 60 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

After the division, we end up with 61286.66 and a remainder of 0.006.