463443 ÷ 90 
The aim is to understand the frequency of 90 in 463443.

On to step 1:
If we divide 4 by 90, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 90

Let's proceed to step 2:
If we divide 46 by 90, we get 0 and a remainder of 46.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 46 to get 46.
Fetch the next digit (3) from the dividend, attach it to 46 and continue: 463 / 90

Step 3:
90 can be fit into 463 5 times, resulting in a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 450 away from 463, we end up with 13.
Bring next digit (4) of the dividend behind the 13 and repeat the process: 134 / 90

Let's proceed to step 4:
134 divided by 90 is 1 with a remainder of 44.
The next digit of our result is 1. 
Result so far: 51.0
If we take 90 away from 134, we end up with 44.
Append the next digit (4) from the dividend to 44 and continue with: 444 / 90

Advancing to step 5:
The number 90 fits into 444 4 times, leaving a remainder of 84.
Record the quotient 4 as the next digit in the result. 
Result so far: 514.0
Subtracting 360 from 444 leaves us with 84.
Append the next digit (3) from the dividend to 84 and continue with: 843 / 90

Advancing to step 6:
If we divide 843 by 90, we get 9 and a remainder of 33.
Write down 9 as next digit of the result. 
Result so far: 5149.0
If we subtract 810 from 843, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 7:
The number 90 fits into 330 3 times, leaving a remainder of 60.
Record the quotient 3 as the next digit in the result. 
Result so far: 5149.3
Subtracting 270 from 330 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.

Going ahead to step 8:
90 goes into 600 6 times with a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 5149.36
Subtracting 540 from 600 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.

Step 9:
90 goes into 600 6 times with a remainder of 60.
The next digit of our result is 6. 
Result so far: 5149.366
Subtracting 540 from 600 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.

The final result is 5149.366 with a remainder of 0.006.