We're dividing 45910102 by 90 
The aim is to understand the frequency of 90 in 45910102.

Step 1:
The number 90 fits into 4 0 times, leaving a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 90

Let's proceed to step 2:
90 goes into 45 0 times with a remainder of 45.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 45 leaves us with 45.
Include the next digit (9) from the dividend after 45, then repeat: 459 / 90

Moving on to step 3:
When dividing 459 by 90, we get 5 with a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we subtract 450 from 459, we get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 90

Let's proceed to step 4:
90 goes into 91 1 times with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 51.0
Subtracting 90 from 91 leaves us with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 90

Step 5:
The number 90 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 510.0
If we subtract 0 from 10, we get 10.
Append the next digit (1) from the dividend to 10 and continue with: 101 / 90

Let's proceed to step 6:
When dividing 101 by 90, we get 1 with a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 5101.0
Subtract 90 from 101 to get 11.
Grab the next digit (0) from the dividend, add it to 11, then carry on: 110 / 90

Step 7:
90 goes into 110 1 times with a remainder of 20.
The next digit of our result is 1. 
Result so far: 51011.0
If we take 90 away from 110, we end up with 20.
Append the next digit (2) from the dividend to 20 and continue with: 202 / 90

Let's proceed to step 8:
The number 90 fits into 202 2 times, leaving a remainder of 22.
Record the quotient 2 as the next digit in the result. 
Result so far: 510112.0
Deduct 180 from 202 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 9:
220 divided by 90 is 2 with a remainder of 40.
The next digit of our result is 2. 
Result so far: 510112.2
If we take 180 away from 220, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
If we divide 400 by 90, we get 4 and a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 510112.24
Subtracting 360 from 400 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 11:
90 goes into 400 4 times with a remainder of 40.
The next digit of our result is 4. 
Result so far: 510112.244
The remainder is 40 after subtracting 360 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

In conclusion, the division gives 510112.244 with a balance of 0.004.