We look at the division of 99697276 by 604 
The aim is to understand the frequency of 604 in 99697276.

On to step 1:
If we divide 9 by 604, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 604

On to step 2:
604 goes into 99 0 times with a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 99, we get 99.
Take the next digit (6) from the dividend and append it to 99, then repeat: 996 / 604

Step 3:
The number 604 fits into 996 1 times, leaving a remainder of 392.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 604 from 996 to get 392.
Grab the next digit (9) from the dividend, add it to 392, then carry on: 3929 / 604

On to step 4:
3929 divided by 604 is 6 with a remainder of 305.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtract 3624 from 3929 to get 305.
Take the next digit (7) from the dividend and append it to 305, then repeat: 3057 / 604

Advancing to step 5:
If we divide 3057 by 604, we get 5 and a remainder of 37.
Write down 5 as next digit of the result. 
Result so far: 165.0
The remainder is 37 after subtracting 3020 from 3057.
Bring next digit (2) of the dividend behind the 37 and repeat the process: 372 / 604

Step 6:
The number 604 fits into 372 0 times, leaving a remainder of 372.
The number 0 becomes the next digit in our result. 
Result so far: 1650.0
Subtract 0 from 372 to get 372.
Append the next digit (7) from the dividend to 372 and continue with: 3727 / 604

Moving on to step 7:
If we divide 3727 by 604, we get 6 and a remainder of 103.
Record the quotient 6 as the next digit in the result. 
Result so far: 16506.0
Deduct 3624 from 3727 and we're left with 103.
Grab the next digit (6) from the dividend, add it to 103, then carry on: 1036 / 604

Advancing to step 8:
1036 divided by 604 is 1 with a remainder of 432.
Put 1 as the next digit of the answer. 
Result so far: 165061.0
Subtract 604 from 1036 to get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Going ahead to step 9:
When dividing 4320 by 604, we get 7 with a remainder of 92.
Put 7 as the next digit of the answer. 
Result so far: 165061.7
If we take 4228 away from 4320, we end up with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Advancing to step 10:
The number 604 fits into 920 1 times, leaving a remainder of 316.
The number 1 becomes the next digit in our result. 
Result so far: 165061.71
Deduct 604 from 920 and we're left with 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Advancing to step 11:
If we divide 3160 by 604, we get 5 and a remainder of 140.
The number 5 becomes the next digit in our result. 
Result so far: 165061.715
If we take 3020 away from 3160, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 12:
If we divide 1400 by 604, we get 2 and a remainder of 192.
The next digit of our result is 2. 
Result so far: 165061.7152
Deduct 1208 from 1400 and we're left with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Let's proceed to step 13:
When dividing 1920 by 604, we get 3 with a remainder of 108.
The next digit of our result is 3. 
Result so far: 165061.71523
Subtracting 1812 from 1920 leaves us with 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 14:
1080 divided by 604 is 1 with a remainder of 476.
Use 1 as the next digit of our solution. 
Result so far: 165061.715231
The remainder is 476 after subtracting 604 from 1080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4760, and continue the process.

Let's proceed to step 15:
604 goes into 4760 7 times with a remainder of 532.
Put 7 as the next digit of the answer. 
Result so far: 165061.7152317
If we subtract 4228 from 4760, we get 532.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5320, and continue the process.

Advancing to step 16:
5320 divided by 604 is 8 with a remainder of 488.
Write down 8 as next digit of the result. 
Result so far: 165061.71523178
Subtract 4832 from 5320 to get 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

The final result is 165061.71523178 with a remainder of 4.88e-07.