39654701 divided by 90 
The aim is to understand the frequency of 90 in 39654701.

Moving on to step 1:
The number 90 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 90

Let's proceed to step 2:
The number 90 fits into 39 0 times, leaving a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Fetch the next digit (6) from the dividend, attach it to 39 and continue: 396 / 90

Let's proceed to step 3:
396 divided by 90 is 4 with a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
The remainder is 36 after subtracting 360 from 396.
Fetch the next digit (5) from the dividend, attach it to 36 and continue: 365 / 90

Let's proceed to step 4:
90 goes into 365 4 times with a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 44.0
Subtracting 360 from 365 leaves us with 5.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 90

Moving on to step 5:
54 divided by 90 is 0 with a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 440.0
If we subtract 0 from 54, we get 54.
Include the next digit (7) from the dividend after 54, then repeat: 547 / 90

Let's proceed to step 6:
90 can be fit into 547 6 times, resulting in a remainder of 7.
Put 6 as the next digit of the answer. 
Result so far: 4406.0
Subtracting 540 from 547 leaves us with 7.
Take the next digit (0) from the dividend and append it to 7, then repeat: 70 / 90

Advancing to step 7:
70 divided by 90 is 0 with a remainder of 70.
Use 0 as the next digit of our solution. 
Result so far: 44060.0
The remainder is 70 after subtracting 0 from 70.
Include the next digit (1) from the dividend after 70, then repeat: 701 / 90

Let's proceed to step 8:
If we divide 701 by 90, we get 7 and a remainder of 71.
Record the quotient 7 as the next digit in the result. 
Result so far: 440607.0
Subtracting 630 from 701 leaves us with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 9:
710 divided by 90 is 7 with a remainder of 80.
The next digit of our result is 7. 
Result so far: 440607.7
Subtracting 630 from 710 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 10:
The number 90 fits into 800 8 times, leaving a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 440607.78
Deduct 720 from 800 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 11:
90 goes into 800 8 times with a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 440607.788
Subtracting 720 from 800 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 440607.788 with a remainder of 0.008.