Let's divide 17630737 by 90
The aim is to understand the frequency of 90 in 17630737.

Moving on to step 1:
90 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 90

Let's proceed to step 2:
90 goes into 17 0 times with a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 17 leaves us with 17.
Include the next digit (6) from the dividend after 17, then repeat: 176 / 90

Let's proceed to step 3:
The number 90 fits into 176 1 times, leaving a remainder of 86.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 86 after subtracting 90 from 176.
Grab the next digit (3) from the dividend, add it to 86, then carry on: 863 / 90

Step 4:
The number 90 fits into 863 9 times, leaving a remainder of 53.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Deduct 810 from 863 and we're left with 53.
Bring next digit (0) of the dividend behind the 53 and repeat the process: 530 / 90

Step 5:
90 goes into 530 5 times with a remainder of 80.
The next digit of our result is 5. 
Result so far: 195.0
If we subtract 450 from 530, we get 80.
Fetch the next digit (7) from the dividend, attach it to 80 and continue: 807 / 90

Moving on to step 6:
90 goes into 807 8 times with a remainder of 87.
Record the quotient 8 as the next digit in the result. 
Result so far: 1958.0
The remainder is 87 after subtracting 720 from 807.
Append the next digit (3) from the dividend to 87 and continue with: 873 / 90

Advancing to step 7:
The number 90 fits into 873 9 times, leaving a remainder of 63.
The number 9 becomes the next digit in our result. 
Result so far: 19589.0
The remainder is 63 after subtracting 810 from 873.
Append the next digit (7) from the dividend to 63 and continue with: 637 / 90

Advancing to step 8:
90 can be fit into 637 7 times, resulting in a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 195897.0
Subtract 630 from 637 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 9:
90 can be fit into 70 0 times, resulting in a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 195897.0
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 10:
If we divide 700 by 90, we get 7 and a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 195897.07
The remainder is 70 after subtracting 630 from 700.
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 11:
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: 195897.077
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 final outcome is 195897.077, with a leftover of 0.007.