768120 divided by 90 
The aim is to understand the frequency of 90 in 768120.

Moving on to step 1:
If we divide 7 by 90, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 90

On to step 2:
If we divide 76 by 90, we get 0 and a remainder of 76.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 76 after subtracting 0 from 76.
Grab the next digit (8) from the dividend, add it to 76, then carry on: 768 / 90

Moving on to step 3:
90 goes into 768 8 times with a remainder of 48.
The next digit of our result is 8. 
Result so far: 8.0
If we subtract 720 from 768, we get 48.
Take the next digit (1) from the dividend and append it to 48, then repeat: 481 / 90

Moving on to step 4:
90 can be fit into 481 5 times, resulting in a remainder of 31.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
The remainder is 31 after subtracting 450 from 481.
Bring next digit (2) of the dividend behind the 31 and repeat the process: 312 / 90

Step 5:
90 goes into 312 3 times with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 853.0
Deduct 270 from 312 and we're left with 42.
Append the next digit (0) from the dividend to 42 and continue with: 420 / 90

Let's proceed to step 6:
If we divide 420 by 90, we get 4 and a remainder of 60.
The number 4 becomes the next digit in our result. 
Result so far: 8534.0
Subtracting 360 from 420 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 7:
If we divide 600 by 90, we get 6 and a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 8534.6
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 8:
If we divide 600 by 90, we get 6 and a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 8534.66
Deduct 540 from 600 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final outcome is 8534.66, with a leftover of 0.06.