90045172 divided by 597 
The aim is to understand the frequency of 597 in 90045172.

On to step 1:
9 divided by 597 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 597

Advancing to step 2:
597 goes into 90 0 times with a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Grab the next digit (0) from the dividend, add it to 90, then carry on: 900 / 597

Going ahead to step 3:
597 goes into 900 1 times with a remainder of 303.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 303 after subtracting 597 from 900.
Include the next digit (4) from the dividend after 303, then repeat: 3034 / 597

Step 4:
When dividing 3034 by 597, we get 5 with a remainder of 49.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we subtract 2985 from 3034, we get 49.
Take the next digit (5) from the dividend and append it to 49, then repeat: 495 / 597

Going ahead to step 5:
If we divide 495 by 597, we get 0 and a remainder of 495.
Put 0 as the next digit of the answer. 
Result so far: 150.0
If we subtract 0 from 495, we get 495.
Grab the next digit (1) from the dividend, add it to 495, then carry on: 4951 / 597

Let's proceed to step 6:
The number 597 fits into 4951 8 times, leaving a remainder of 175.
Use 8 as the next digit of our solution. 
Result so far: 1508.0
Deduct 4776 from 4951 and we're left with 175.
Bring next digit (7) of the dividend behind the 175 and repeat the process: 1757 / 597

Moving on to step 7:
The number 597 fits into 1757 2 times, leaving a remainder of 563.
The number 2 becomes the next digit in our result. 
Result so far: 15082.0
Deduct 1194 from 1757 and we're left with 563.
Bring next digit (2) of the dividend behind the 563 and repeat the process: 5632 / 597

Advancing to step 8:
If we divide 5632 by 597, we get 9 and a remainder of 259.
Use 9 as the next digit of our solution. 
Result so far: 150829.0
Deduct 5373 from 5632 and we're left with 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

On to step 9:
If we divide 2590 by 597, we get 4 and a remainder of 202.
The next digit of our result is 4. 
Result so far: 150829.4
If we take 2388 away from 2590, we end up with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Advancing to step 10:
If we divide 2020 by 597, we get 3 and a remainder of 229.
The next digit of our result is 3. 
Result so far: 150829.43
Deduct 1791 from 2020 and we're left with 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Let's proceed to step 11:
The number 597 fits into 2290 3 times, leaving a remainder of 499.
The number 3 becomes the next digit in our result. 
Result so far: 150829.433
Subtract 1791 from 2290 to get 499.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4990, and continue the process.

The final result is 150829.433 with a remainder of 0.0499.