We look at the division of 90691963 by 455 
The aim is to understand the frequency of 455 in 90691963.

Step 1:
The number 455 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 455

Going ahead to step 2:
455 goes into 90 0 times with a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Fetch the next digit (6) from the dividend, attach it to 90 and continue: 906 / 455

On to step 3:
The number 455 fits into 906 1 times, leaving a remainder of 451.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 455 away from 906, we end up with 451.
Take the next digit (9) from the dividend and append it to 451, then repeat: 4519 / 455

Going ahead to step 4:
When dividing 4519 by 455, we get 9 with a remainder of 424.
Write down 9 as next digit of the result. 
Result so far: 19.0
If we take 4095 away from 4519, we end up with 424.
Grab the next digit (1) from the dividend, add it to 424, then carry on: 4241 / 455

Moving on to step 5:
4241 divided by 455 is 9 with a remainder of 146.
Record the quotient 9 as the next digit in the result. 
Result so far: 199.0
Subtract 4095 from 4241 to get 146.
Include the next digit (9) from the dividend after 146, then repeat: 1469 / 455

Step 6:
When dividing 1469 by 455, we get 3 with a remainder of 104.
The number 3 becomes the next digit in our result. 
Result so far: 1993.0
The remainder is 104 after subtracting 1365 from 1469.
Fetch the next digit (6) from the dividend, attach it to 104 and continue: 1046 / 455

Let's proceed to step 7:
455 goes into 1046 2 times with a remainder of 136.
Record the quotient 2 as the next digit in the result. 
Result so far: 19932.0
Subtracting 910 from 1046 leaves us with 136.
Include the next digit (3) from the dividend after 136, then repeat: 1363 / 455

On to step 8:
If we divide 1363 by 455, we get 2 and a remainder of 453.
Use 2 as the next digit of our solution. 
Result so far: 199322.0
The remainder is 453 after subtracting 910 from 1363.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4530, and continue the process.

Going ahead to step 9:
The number 455 fits into 4530 9 times, leaving a remainder of 435.
The number 9 becomes the next digit in our result. 
Result so far: 199322.9
If we take 4095 away from 4530, we end up with 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

On to step 10:
455 goes into 4350 9 times with a remainder of 255.
Record the quotient 9 as the next digit in the result. 
Result so far: 199322.99
Subtracting 4095 from 4350 leaves us with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Our division results in 199322.99 with a remaining 0.255.