We look at the division of 548521 by 9 
The aim is to understand the frequency of 9 in 548521.

Moving on to step 1:
9 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
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 / 9

Going ahead to step 2:
54 divided by 9 is 6 with a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we subtract 54 from 54, we get 0.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 9

Advancing to step 3:
9 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 60.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 9

Advancing to step 4:
9 goes into 85 9 times with a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 609.0
The remainder is 4 after subtracting 81 from 85.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 9

Moving on to step 5:
42 divided by 9 is 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 6094.0
Deduct 36 from 42 and we're left with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 9

Going ahead to step 6:
9 goes into 61 6 times with a remainder of 7.
Use 6 as the next digit of our solution. 
Result so far: 60946.0
The remainder is 7 after subtracting 54 from 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
When dividing 70 by 9, we get 7 with a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 60946.7
The remainder is 7 after subtracting 63 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
9 can be fit into 70 7 times, resulting in a remainder of 7.
Put 7 as the next digit of the answer. 
Result so far: 60946.77
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

After the division, we end up with 60946.77 and a remainder of 0.007.