We look at the division of 499431 by 90 
The aim is to understand the frequency of 90 in 499431.

Let's proceed to step 1:
90 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 90

Advancing to step 2:
When dividing 49 by 90, we get 0 with a remainder of 49.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 49, we get 49.
Append the next digit (9) from the dividend to 49 and continue with: 499 / 90

Let's proceed to step 3:
When dividing 499 by 90, we get 5 with a remainder of 49.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 49 after subtracting 450 from 499.
Append the next digit (4) from the dividend to 49 and continue with: 494 / 90

On to step 4:
When dividing 494 by 90, we get 5 with a remainder of 44.
The next digit of our result is 5. 
Result so far: 55.0
If we take 450 away from 494, we end up with 44.
Append the next digit (3) from the dividend to 44 and continue with: 443 / 90

Step 5:
The number 90 fits into 443 4 times, leaving a remainder of 83.
Write down 4 as next digit of the result. 
Result so far: 554.0
Subtract 360 from 443 to get 83.
Append the next digit (1) from the dividend to 83 and continue with: 831 / 90

Moving on to step 6:
831 divided by 90 is 9 with a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 5549.0
The remainder is 21 after subtracting 810 from 831.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 7:
When dividing 210 by 90, we get 2 with a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 5549.2
Subtract 180 from 210 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 8:
When dividing 300 by 90, we get 3 with a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 5549.23
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 9:
The number 90 fits into 300 3 times, leaving a remainder of 30.
The next digit of our result is 3. 
Result so far: 5549.233
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Our division results in 5549.233 with a remaining 0.003.