548814 divided by 90 
The aim is to understand the frequency of 90 in 548814.

Going ahead to step 1:
5 divided by 90 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 90

Step 2:
90 can be fit into 54 0 times, resulting in a remainder of 54.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 54 to get 54.
Append the next digit (8) from the dividend to 54 and continue with: 548 / 90

Step 3:
When dividing 548 by 90, we get 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 6.0
If we subtract 540 from 548, we get 8.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 90

Let's proceed to step 4:
88 divided by 90 is 0 with a remainder of 88.
The next digit of our result is 0. 
Result so far: 60.0
Deduct 0 from 88 and we're left with 88.
Grab the next digit (1) from the dividend, add it to 88, then carry on: 881 / 90

Step 5:
When dividing 881 by 90, we get 9 with a remainder of 71.
The next digit of our result is 9. 
Result so far: 609.0
The remainder is 71 after subtracting 810 from 881.
Append the next digit (4) from the dividend to 71 and continue with: 714 / 90

Step 6:
When dividing 714 by 90, we get 7 with a remainder of 84.
The next digit of our result is 7. 
Result so far: 6097.0
The remainder is 84 after subtracting 630 from 714.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Moving on to step 7:
840 divided by 90 is 9 with a remainder of 30.
Record the quotient 9 as the next digit in the result. 
Result so far: 6097.9
Subtracting 810 from 840 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 8:
90 goes into 300 3 times with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 6097.93
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
If we divide 300 by 90, we get 3 and a remainder of 30.
Record the quotient 3 as the next digit in the result. 
Result so far: 6097.933
If we subtract 270 from 300, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 6097.933 with a remainder of 0.003.