We look at the division of 655085 by 90 
The aim is to understand the frequency of 90 in 655085.

Let's proceed to step 1:
The number 90 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 90

On to step 2:
If we divide 65 by 90, we get 0 and a remainder of 65.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 65, we end up with 65.
Bring next digit (5) of the dividend behind the 65 and repeat the process: 655 / 90

Going ahead to step 3:
90 goes into 655 7 times with a remainder of 25.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtract 630 from 655 to get 25.
Take the next digit (0) from the dividend and append it to 25, then repeat: 250 / 90

Step 4:
90 goes into 250 2 times with a remainder of 70.
Put 2 as the next digit of the answer. 
Result so far: 72.0
Deduct 180 from 250 and we're left with 70.
Fetch the next digit (8) from the dividend, attach it to 70 and continue: 708 / 90

On to step 5:
The number 90 fits into 708 7 times, leaving a remainder of 78.
Put 7 as the next digit of the answer. 
Result so far: 727.0
Deduct 630 from 708 and we're left with 78.
Append the next digit (5) from the dividend to 78 and continue with: 785 / 90

Moving on to step 6:
90 can be fit into 785 8 times, resulting in a remainder of 65.
Record the quotient 8 as the next digit in the result. 
Result so far: 7278.0
Subtracting 720 from 785 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 7:
90 can be fit into 650 7 times, resulting in a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 7278.7
If we take 630 away from 650, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
90 can be fit into 200 2 times, resulting in a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 7278.72
Deduct 180 from 200 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
90 can be fit into 200 2 times, resulting in a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 7278.722
Deduct 180 from 200 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 7278.722, with a leftover of 0.002.