783664 ÷ 90 
The aim is to understand the frequency of 90 in 783664.

Step 1:
90 goes into 7 0 times with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 90

Step 2:
90 goes into 78 0 times with a remainder of 78.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 78, we get 78.
Append the next digit (3) from the dividend to 78 and continue with: 783 / 90

Going ahead to step 3:
90 goes into 783 8 times with a remainder of 63.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 63 after subtracting 720 from 783.
Grab the next digit (6) from the dividend, add it to 63, then carry on: 636 / 90

Step 4:
636 divided by 90 is 7 with a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 87.0
Deduct 630 from 636 and we're left with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 90

Moving on to step 5:
66 divided by 90 is 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 870.0
Subtracting 0 from 66 leaves us with 66.
Include the next digit (4) from the dividend after 66, then repeat: 664 / 90

Advancing to step 6:
90 goes into 664 7 times with a remainder of 34.
Write down 7 as next digit of the result. 
Result so far: 8707.0
If we take 630 away from 664, we end up with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 7:
If we divide 340 by 90, we get 3 and a remainder of 70.
The next digit of our result is 3. 
Result so far: 8707.3
The remainder is 70 after subtracting 270 from 340.
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:
If we divide 700 by 90, we get 7 and a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 8707.37
Deduct 630 from 700 and we're left 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.

On to step 9:
When dividing 700 by 90, we get 7 with a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 8707.377
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.

In conclusion, the division gives 8707.377 with a balance of 0.007.