90577971 ÷ 408 
The aim is to understand the frequency of 408 in 90577971.

Moving on to step 1:
When dividing 9 by 408, we get 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 408

Moving on to step 2:
When dividing 90 by 408, we get 0 with a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Append the next digit (5) from the dividend to 90 and continue with: 905 / 408

Advancing to step 3:
If we divide 905 by 408, we get 2 and a remainder of 89.
Write down 2 as next digit of the result. 
Result so far: 2.0
The remainder is 89 after subtracting 816 from 905.
Take the next digit (7) from the dividend and append it to 89, then repeat: 897 / 408

Let's proceed to step 4:
If we divide 897 by 408, we get 2 and a remainder of 81.
Put 2 as the next digit of the answer. 
Result so far: 22.0
Subtract 816 from 897 to get 81.
Grab the next digit (7) from the dividend, add it to 81, then carry on: 817 / 408

On to step 5:
The number 408 fits into 817 2 times, leaving a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 222.0
Deduct 816 from 817 and we're left with 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 408

Let's proceed to step 6:
The number 408 fits into 19 0 times, leaving a remainder of 19.
Use 0 as the next digit of our solution. 
Result so far: 2220.0
If we take 0 away from 19, we end up with 19.
Append the next digit (7) from the dividend to 19 and continue with: 197 / 408

Going ahead to step 7:
197 divided by 408 is 0 with a remainder of 197.
Use 0 as the next digit of our solution. 
Result so far: 22200.0
If we take 0 away from 197, we end up with 197.
Bring next digit (1) of the dividend behind the 197 and repeat the process: 1971 / 408

Moving on to step 8:
408 can be fit into 1971 4 times, resulting in a remainder of 339.
The next digit of our result is 4. 
Result so far: 222004.0
Subtracting 1632 from 1971 leaves us with 339.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3390, and continue the process.

Going ahead to step 9:
When dividing 3390 by 408, we get 8 with a remainder of 126.
The next digit of our result is 8. 
Result so far: 222004.8
If we subtract 3264 from 3390, we get 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Step 10:
408 can be fit into 1260 3 times, resulting in a remainder of 36.
Use 3 as the next digit of our solution. 
Result so far: 222004.83
The remainder is 36 after subtracting 1224 from 1260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 11:
360 divided by 408 is 0 with a remainder of 360.
Record the quotient 0 as the next digit in the result. 
Result so far: 222004.83
If we subtract 0 from 360, we get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Moving on to step 12:
3600 divided by 408 is 8 with a remainder of 336.
The next digit of our result is 8. 
Result so far: 222004.8308
If we take 3264 away from 3600, we end up with 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

On to step 13:
3360 divided by 408 is 8 with a remainder of 96.
The next digit of our result is 8. 
Result so far: 222004.83088
Subtracting 3264 from 3360 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

The quotient of the division is 222004.83088, and the remainder is 9.6e-05.