453562 ÷ 90 
The aim is to understand the frequency of 90 in 453562.

Advancing to step 1:
4 divided by 90 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 90

Step 2:
90 goes into 45 0 times with a remainder of 45.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 45 after subtracting 0 from 45.
Append the next digit (3) from the dividend to 45 and continue with: 453 / 90

Let's proceed to step 3:
90 goes into 453 5 times with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 450 from 453 and we're left with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 90

Moving on to step 4:
If we divide 35 by 90, we get 0 and a remainder of 35.
Put 0 as the next digit of the answer. 
Result so far: 50.0
If we take 0 away from 35, we end up with 35.
Take the next digit (6) from the dividend and append it to 35, then repeat: 356 / 90

On to step 5:
356 divided by 90 is 3 with a remainder of 86.
The next digit of our result is 3. 
Result so far: 503.0
If we subtract 270 from 356, we get 86.
Fetch the next digit (2) from the dividend, attach it to 86 and continue: 862 / 90

On to step 6:
90 can be fit into 862 9 times, resulting in a remainder of 52.
Write down 9 as next digit of the result. 
Result so far: 5039.0
Subtract 810 from 862 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Advancing to step 7:
520 divided by 90 is 5 with a remainder of 70.
The number 5 becomes the next digit in our result. 
Result so far: 5039.5
The remainder is 70 after subtracting 450 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 8:
90 goes into 700 7 times with a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 5039.57
If we subtract 630 from 700, we 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.

Moving on to step 9:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 5039.577
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.

The quotient of the division is 5039.577, and the remainder is 0.007.