817758 divided by 90 
The aim is to understand the frequency of 90 in 817758.

On to step 1:
The number 90 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 90

Let's proceed to step 2:
90 can be fit into 81 0 times, resulting in a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Include the next digit (7) from the dividend after 81, then repeat: 817 / 90

Step 3:
The number 90 fits into 817 9 times, leaving a remainder of 7.
Put 9 as the next digit of the answer. 
Result so far: 9.0
Subtract 810 from 817 to get 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 90

Let's proceed to step 4:
77 divided by 90 is 0 with a remainder of 77.
The next digit of our result is 0. 
Result so far: 90.0
If we subtract 0 from 77, we get 77.
Append the next digit (5) from the dividend to 77 and continue with: 775 / 90

Advancing to step 5:
90 goes into 775 8 times with a remainder of 55.
Record the quotient 8 as the next digit in the result. 
Result so far: 908.0
The remainder is 55 after subtracting 720 from 775.
Take the next digit (8) from the dividend and append it to 55, then repeat: 558 / 90

Going ahead to step 6:
90 can be fit into 558 6 times, resulting in a remainder of 18.
The next digit of our result is 6. 
Result so far: 9086.0
If we subtract 540 from 558, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 7:
If we divide 180 by 90, we get 2 and a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 9086.2
Subtracting 180 from 180 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.

Moving on to step 8:
90 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 9086.2
Subtract 0 from 0 to 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.

On to step 9:
If we divide 0 by 90, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 9086.2
Subtracting 0 from 0 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.

The final outcome is 9086.2, with a leftover of 0.0.