90919974 divided by 408 
The aim is to understand the frequency of 408 in 90919974.

Moving on to step 1:
9 divided by 408 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 408

Advancing to step 2:
408 goes into 90 0 times with a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Append the next digit (9) from the dividend to 90 and continue with: 909 / 408

Moving on to step 3:
909 divided by 408 is 2 with a remainder of 93.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 816 from 909 to get 93.
Fetch the next digit (1) from the dividend, attach it to 93 and continue: 931 / 408

Advancing to step 4:
408 can be fit into 931 2 times, resulting in a remainder of 115.
The number 2 becomes the next digit in our result. 
Result so far: 22.0
If we subtract 816 from 931, we get 115.
Take the next digit (9) from the dividend and append it to 115, then repeat: 1159 / 408

Step 5:
The number 408 fits into 1159 2 times, leaving a remainder of 343.
Use 2 as the next digit of our solution. 
Result so far: 222.0
Subtract 816 from 1159 to get 343.
Append the next digit (9) from the dividend to 343 and continue with: 3439 / 408

Moving on to step 6:
408 can be fit into 3439 8 times, resulting in a remainder of 175.
Write down 8 as next digit of the result. 
Result so far: 2228.0
Subtract 3264 from 3439 to get 175.
Fetch the next digit (7) from the dividend, attach it to 175 and continue: 1757 / 408

Going ahead to step 7:
The number 408 fits into 1757 4 times, leaving a remainder of 125.
The number 4 becomes the next digit in our result. 
Result so far: 22284.0
If we take 1632 away from 1757, we end up with 125.
Bring next digit (4) of the dividend behind the 125 and repeat the process: 1254 / 408

Moving on to step 8:
408 goes into 1254 3 times with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 222843.0
Subtract 1224 from 1254 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 9:
When dividing 300 by 408, we get 0 with a remainder of 300.
Use 0 as the next digit of our solution. 
Result so far: 222843.0
Deduct 0 from 300 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 10:
408 can be fit into 3000 7 times, resulting in a remainder of 144.
The next digit of our result is 7. 
Result so far: 222843.07
The remainder is 144 after subtracting 2856 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Step 11:
408 can be fit into 1440 3 times, resulting in a remainder of 216.
The next digit of our result is 3. 
Result so far: 222843.073
Subtracting 1224 from 1440 leaves us with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Moving on to step 12:
When dividing 2160 by 408, we get 5 with a remainder of 120.
Use 5 as the next digit of our solution. 
Result so far: 222843.0735
Deduct 2040 from 2160 and we're left with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 13:
408 goes into 1200 2 times with a remainder of 384.
Put 2 as the next digit of the answer. 
Result so far: 222843.07352
If we subtract 816 from 1200, we get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Advancing to step 14:
If we divide 3840 by 408, we get 9 and a remainder of 168.
Write down 9 as next digit of the result. 
Result so far: 222843.073529
Subtract 3672 from 3840 to get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

On to step 15:
408 goes into 1680 4 times with a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 222843.0735294
The remainder is 48 after subtracting 1632 from 1680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 16:
408 can be fit into 480 1 times, resulting in a remainder of 72.
Write down 1 as next digit of the result. 
Result so far: 222843.07352941
If we take 408 away from 480, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

After the division, we end up with 222843.07352941 and a remainder of 7.2e-08.