We look at the division of 75675991 by 408 
The aim is to understand the frequency of 408 in 75675991.

Moving on to step 1:
When dividing 7 by 408, we get 0 with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (5) from the dividend to 7 and continue with: 75 / 408

Let's proceed to step 2:
408 goes into 75 0 times with a remainder of 75.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 75, we get 75.
Include the next digit (6) from the dividend after 75, then repeat: 756 / 408

Let's proceed to step 3:
The number 408 fits into 756 1 times, leaving a remainder of 348.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 408 from 756 to get 348.
Bring next digit (7) of the dividend behind the 348 and repeat the process: 3487 / 408

Moving on to step 4:
When dividing 3487 by 408, we get 8 with a remainder of 223.
Write down 8 as next digit of the result. 
Result so far: 18.0
If we subtract 3264 from 3487, we get 223.
Include the next digit (5) from the dividend after 223, then repeat: 2235 / 408

On to step 5:
If we divide 2235 by 408, we get 5 and a remainder of 195.
Record the quotient 5 as the next digit in the result. 
Result so far: 185.0
Deduct 2040 from 2235 and we're left with 195.
Fetch the next digit (9) from the dividend, attach it to 195 and continue: 1959 / 408

Moving on to step 6:
If we divide 1959 by 408, we get 4 and a remainder of 327.
The next digit of our result is 4. 
Result so far: 1854.0
If we take 1632 away from 1959, we end up with 327.
Bring next digit (9) of the dividend behind the 327 and repeat the process: 3279 / 408

On to step 7:
The number 408 fits into 3279 8 times, leaving a remainder of 15.
The next digit of our result is 8. 
Result so far: 18548.0
Subtract 3264 from 3279 to get 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 408

Moving on to step 8:
151 divided by 408 is 0 with a remainder of 151.
Record the quotient 0 as the next digit in the result. 
Result so far: 185480.0
The remainder is 151 after subtracting 0 from 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Let's proceed to step 9:
If we divide 1510 by 408, we get 3 and a remainder of 286.
Record the quotient 3 as the next digit in the result. 
Result so far: 185480.3
Subtract 1224 from 1510 to get 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

On to step 10:
2860 divided by 408 is 7 with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 185480.37
If we take 2856 away from 2860, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 11:
40 divided by 408 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 185480.37
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
400 divided by 408 is 0 with a remainder of 400.
The number 0 becomes the next digit in our result. 
Result so far: 185480.37
If we take 0 away from 400, we end up with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

In conclusion, the division gives 185480.37 with a balance of 0.004.