We look at the division of 66305963 by 605 
The aim is to understand the frequency of 605 in 66305963.

Step 1:
When dividing 6 by 605, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 605

Advancing to step 2:
When dividing 66 by 605, we get 0 with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Take the next digit (3) from the dividend and append it to 66, then repeat: 663 / 605

Advancing to step 3:
605 can be fit into 663 1 times, resulting in a remainder of 58.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 605 from 663 and we're left with 58.
Fetch the next digit (0) from the dividend, attach it to 58 and continue: 580 / 605

On to step 4:
When dividing 580 by 605, we get 0 with a remainder of 580.
Write down 0 as next digit of the result. 
Result so far: 10.0
The remainder is 580 after subtracting 0 from 580.
Fetch the next digit (5) from the dividend, attach it to 580 and continue: 5805 / 605

Going ahead to step 5:
605 can be fit into 5805 9 times, resulting in a remainder of 360.
The next digit of our result is 9. 
Result so far: 109.0
Deduct 5445 from 5805 and we're left with 360.
Grab the next digit (9) from the dividend, add it to 360, then carry on: 3609 / 605

Moving on to step 6:
If we divide 3609 by 605, we get 5 and a remainder of 584.
Use 5 as the next digit of our solution. 
Result so far: 1095.0
Deduct 3025 from 3609 and we're left with 584.
Append the next digit (6) from the dividend to 584 and continue with: 5846 / 605

Step 7:
605 can be fit into 5846 9 times, resulting in a remainder of 401.
Record the quotient 9 as the next digit in the result. 
Result so far: 10959.0
Subtracting 5445 from 5846 leaves us with 401.
Append the next digit (3) from the dividend to 401 and continue with: 4013 / 605

Step 8:
605 can be fit into 4013 6 times, resulting in a remainder of 383.
The next digit of our result is 6. 
Result so far: 109596.0
If we subtract 3630 from 4013, we get 383.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3830, and continue the process.

On to step 9:
605 goes into 3830 6 times with a remainder of 200.
The next digit of our result is 6. 
Result so far: 109596.6
Subtracting 3630 from 3830 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 10:
The number 605 fits into 2000 3 times, leaving a remainder of 185.
The number 3 becomes the next digit in our result. 
Result so far: 109596.63
If we take 1815 away from 2000, we end up with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Moving on to step 11:
The number 605 fits into 1850 3 times, leaving a remainder of 35.
Put 3 as the next digit of the answer. 
Result so far: 109596.633
Subtract 1815 from 1850 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

In conclusion, the division gives 109596.633 with a balance of 0.0035.