Let's divide 423707 by 90
The aim is to understand the frequency of 90 in 423707.

Going ahead to step 1:
4 divided by 90 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 90

Let's proceed to step 2:
The number 90 fits into 42 0 times, leaving a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Grab the next digit (3) from the dividend, add it to 42, then carry on: 423 / 90

Moving on to step 3:
90 goes into 423 4 times with a remainder of 63.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 360 from 423 to get 63.
Take the next digit (7) from the dividend and append it to 63, then repeat: 637 / 90

Let's proceed to step 4:
If we divide 637 by 90, we get 7 and a remainder of 7.
The next digit of our result is 7. 
Result so far: 47.0
Subtract 630 from 637 to get 7.
Bring next digit (0) of the dividend behind the 7 and repeat the process: 70 / 90

Step 5:
90 can be fit into 70 0 times, resulting in a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 470.0
Deduct 0 from 70 and we're left with 70.
Take the next digit (7) from the dividend and append it to 70, then repeat: 707 / 90

Step 6:
If we divide 707 by 90, we get 7 and a remainder of 77.
Use 7 as the next digit of our solution. 
Result so far: 4707.0
If we take 630 away from 707, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

On to step 7:
If we divide 770 by 90, we get 8 and a remainder of 50.
The next digit of our result is 8. 
Result so far: 4707.8
Subtract 720 from 770 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 8:
When dividing 500 by 90, we get 5 with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 4707.85
Subtract 450 from 500 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 9:
90 can be fit into 500 5 times, resulting in a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 4707.855
Subtract 450 from 500 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final result is 4707.855 with a remainder of 0.005.