We look at the division of 472338 by 90 
The aim is to understand the frequency of 90 in 472338.

On to step 1:
90 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (7) from the dividend, add it to 4, then carry on: 47 / 90

On to step 2:
If we divide 47 by 90, we get 0 and a remainder of 47.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 47 and we're left with 47.
Bring next digit (2) of the dividend behind the 47 and repeat the process: 472 / 90

On to step 3:
90 can be fit into 472 5 times, resulting in a remainder of 22.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 450 from 472 to get 22.
Grab the next digit (3) from the dividend, add it to 22, then carry on: 223 / 90

Let's proceed to step 4:
The number 90 fits into 223 2 times, leaving a remainder of 43.
Use 2 as the next digit of our solution. 
Result so far: 52.0
Subtracting 180 from 223 leaves us with 43.
Fetch the next digit (3) from the dividend, attach it to 43 and continue: 433 / 90

Step 5:
If we divide 433 by 90, we get 4 and a remainder of 73.
Record the quotient 4 as the next digit in the result. 
Result so far: 524.0
If we take 360 away from 433, we end up with 73.
Append the next digit (8) from the dividend to 73 and continue with: 738 / 90

Step 6:
90 can be fit into 738 8 times, resulting in a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 5248.0
Subtract 720 from 738 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
When dividing 180 by 90, we get 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 5248.2
If we subtract 180 from 180, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
If we divide 0 by 90, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 5248.2
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
If we divide 0 by 90, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 5248.2
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 5248.2 and a remainder of 0.0.