We divide 551007 by 90
The aim is to understand the frequency of 90 in 551007.

Going ahead to step 1:
If we divide 5 by 90, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 90

Going ahead to step 2:
The number 90 fits into 55 0 times, leaving a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Bring next digit (1) of the dividend behind the 55 and repeat the process: 551 / 90

Moving on to step 3:
90 can be fit into 551 6 times, resulting in a remainder of 11.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 540 from 551 and we're left with 11.
Append the next digit (0) from the dividend to 11 and continue with: 110 / 90

On to step 4:
110 divided by 90 is 1 with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 61.0
Subtracting 90 from 110 leaves us with 20.
Grab the next digit (0) from the dividend, add it to 20, then carry on: 200 / 90

On to step 5:
90 goes into 200 2 times with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 612.0
If we subtract 180 from 200, we get 20.
Fetch the next digit (7) from the dividend, attach it to 20 and continue: 207 / 90

Moving on to step 6:
If we divide 207 by 90, we get 2 and a remainder of 27.
Record the quotient 2 as the next digit in the result. 
Result so far: 6122.0
If we subtract 180 from 207, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 7:
The number 90 fits into 270 3 times, leaving a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 6122.3
Subtracting 270 from 270 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.

Advancing to step 8:
If we divide 0 by 90, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 6122.3
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.

Step 9:
0 divided by 90 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 6122.3
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.

Our division results in 6122.3 with a remaining 0.0.