We divide 18704928 by 90
The aim is to understand the frequency of 90 in 18704928.

Advancing to step 1:
90 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 90

Advancing to step 2:
18 divided by 90 is 0 with a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 18 leaves us with 18.
Bring next digit (7) of the dividend behind the 18 and repeat the process: 187 / 90

Let's proceed to step 3:
90 can be fit into 187 2 times, resulting in a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 180 from 187, we get 7.
Take the next digit (0) from the dividend and append it to 7, then repeat: 70 / 90

Moving on to step 4:
If we divide 70 by 90, we get 0 and a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Deduct 0 from 70 and we're left with 70.
Append the next digit (4) from the dividend to 70 and continue with: 704 / 90

On to step 5:
90 can be fit into 704 7 times, resulting in a remainder of 74.
The next digit of our result is 7. 
Result so far: 207.0
Subtract 630 from 704 to get 74.
Include the next digit (9) from the dividend after 74, then repeat: 749 / 90

Let's proceed to step 6:
If we divide 749 by 90, we get 8 and a remainder of 29.
Use 8 as the next digit of our solution. 
Result so far: 2078.0
If we take 720 away from 749, we end up with 29.
Take the next digit (2) from the dividend and append it to 29, then repeat: 292 / 90

On to step 7:
When dividing 292 by 90, we get 3 with a remainder of 22.
The number 3 becomes the next digit in our result. 
Result so far: 20783.0
If we take 270 away from 292, we end up with 22.
Bring next digit (8) of the dividend behind the 22 and repeat the process: 228 / 90

Advancing to step 8:
90 can be fit into 228 2 times, resulting in a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 207832.0
If we take 180 away from 228, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 9:
90 can be fit into 480 5 times, resulting in a remainder of 30.
Put 5 as the next digit of the answer. 
Result so far: 207832.5
If we take 450 away from 480, we end up 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.

On to step 10:
When dividing 300 by 90, we get 3 with a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 207832.53
If we take 270 away from 300, we end up 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.

Going ahead to step 11:
90 can be fit into 300 3 times, resulting in a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 207832.533
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.

The final outcome is 207832.533, with a leftover of 0.003.