We divide 676780 by 90
The aim is to understand the frequency of 90 in 676780.

Going ahead to step 1:
90 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 90

On to step 2:
90 goes into 67 0 times with a remainder of 67.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 67 to get 67.
Append the next digit (6) from the dividend to 67 and continue with: 676 / 90

Moving on to step 3:
When dividing 676 by 90, we get 7 with a remainder of 46.
The next digit of our result is 7. 
Result so far: 7.0
If we subtract 630 from 676, we get 46.
Bring next digit (7) of the dividend behind the 46 and repeat the process: 467 / 90

Advancing to step 4:
The number 90 fits into 467 5 times, leaving a remainder of 17.
The number 5 becomes the next digit in our result. 
Result so far: 75.0
Subtract 450 from 467 to get 17.
Fetch the next digit (8) from the dividend, attach it to 17 and continue: 178 / 90

Going ahead to step 5:
The number 90 fits into 178 1 times, leaving a remainder of 88.
Use 1 as the next digit of our solution. 
Result so far: 751.0
Deduct 90 from 178 and we're left with 88.
Bring next digit (0) of the dividend behind the 88 and repeat the process: 880 / 90

Let's proceed to step 6:
90 can be fit into 880 9 times, resulting in a remainder of 70.
Put 9 as the next digit of the answer. 
Result so far: 7519.0
Subtracting 810 from 880 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.

Advancing to step 7:
When dividing 700 by 90, we get 7 with a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 7519.7
If we take 630 away from 700, we end up 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.

Going ahead to step 8:
90 goes into 700 7 times with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 7519.77
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 result is 7519.77 with a remainder of 0.07.