818179 divided by 90 
The aim is to understand the frequency of 90 in 818179.

Step 1:
8 divided by 90 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 90

Moving on to step 2:
The number 90 fits into 81 0 times, leaving a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Grab the next digit (8) from the dividend, add it to 81, then carry on: 818 / 90

Step 3:
When dividing 818 by 90, we get 9 with a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 810 from 818 to get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 90

Let's proceed to step 4:
When dividing 81 by 90, we get 0 with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 90.0
The remainder is 81 after subtracting 0 from 81.
Take the next digit (7) from the dividend and append it to 81, then repeat: 817 / 90

Moving on to step 5:
The number 90 fits into 817 9 times, leaving a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 909.0
If we take 810 away from 817, we end up with 7.
Include the next digit (9) from the dividend after 7, then repeat: 79 / 90

Step 6:
90 goes into 79 0 times with a remainder of 79.
Write down 0 as next digit of the result. 
Result so far: 9090.0
Deduct 0 from 79 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Moving on to step 7:
If we divide 790 by 90, we get 8 and a remainder of 70.
Write down 8 as next digit of the result. 
Result so far: 9090.8
Subtracting 720 from 790 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 8:
700 divided by 90 is 7 with a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 9090.87
If we subtract 630 from 700, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 9:
When dividing 700 by 90, we get 7 with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 9090.877
Subtract 630 from 700 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 9090.877, with a leftover of 0.007.