We're dividing 52395466 by 408 
The aim is to understand the frequency of 408 in 52395466.

Going ahead to step 1:
When dividing 5 by 408, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 408

Let's proceed to step 2:
When dividing 52 by 408, we get 0 with a remainder of 52.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 52 and we're left with 52.
Append the next digit (3) from the dividend to 52 and continue with: 523 / 408

Moving on to step 3:
523 divided by 408 is 1 with a remainder of 115.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 408 away from 523, we end up with 115.
Grab the next digit (9) from the dividend, add it to 115, then carry on: 1159 / 408

Advancing to step 4:
1159 divided by 408 is 2 with a remainder of 343.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtracting 816 from 1159 leaves us with 343.
Bring next digit (5) of the dividend behind the 343 and repeat the process: 3435 / 408

Advancing to step 5:
The number 408 fits into 3435 8 times, leaving a remainder of 171.
Use 8 as the next digit of our solution. 
Result so far: 128.0
The remainder is 171 after subtracting 3264 from 3435.
Bring next digit (4) of the dividend behind the 171 and repeat the process: 1714 / 408

On to step 6:
408 goes into 1714 4 times with a remainder of 82.
Use 4 as the next digit of our solution. 
Result so far: 1284.0
Subtract 1632 from 1714 to get 82.
Include the next digit (6) from the dividend after 82, then repeat: 826 / 408

Let's proceed to step 7:
408 goes into 826 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 12842.0
If we subtract 816 from 826, we get 10.
Fetch the next digit (6) from the dividend, attach it to 10 and continue: 106 / 408

Moving on to step 8:
When dividing 106 by 408, we get 0 with a remainder of 106.
The number 0 becomes the next digit in our result. 
Result so far: 128420.0
Deduct 0 from 106 and we're left with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

Moving on to step 9:
When dividing 1060 by 408, we get 2 with a remainder of 244.
The next digit of our result is 2. 
Result so far: 128420.2
The remainder is 244 after subtracting 816 from 1060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Going ahead to step 10:
408 goes into 2440 5 times with a remainder of 400.
Record the quotient 5 as the next digit in the result. 
Result so far: 128420.25
If we subtract 2040 from 2440, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 11:
The number 408 fits into 4000 9 times, leaving a remainder of 328.
Write down 9 as next digit of the result. 
Result so far: 128420.259
If we take 3672 away from 4000, we end up with 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Going ahead to step 12:
3280 divided by 408 is 8 with a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 128420.2598
Subtract 3264 from 3280 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 13:
When dividing 160 by 408, we get 0 with a remainder of 160.
Record the quotient 0 as the next digit in the result. 
Result so far: 128420.2598
Subtract 0 from 160 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 14:
The number 408 fits into 1600 3 times, leaving a remainder of 376.
Put 3 as the next digit of the answer. 
Result so far: 128420.259803
If we subtract 1224 from 1600, we get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Let's proceed to step 15:
The number 408 fits into 3760 9 times, leaving a remainder of 88.
Put 9 as the next digit of the answer. 
Result so far: 128420.2598039
If we subtract 3672 from 3760, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 16:
880 divided by 408 is 2 with a remainder of 64.
The number 2 becomes the next digit in our result. 
Result so far: 128420.25980392
The remainder is 64 after subtracting 816 from 880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final result is 128420.25980392 with a remainder of 6.4e-08.