51497905 divided by 408 
The aim is to understand the frequency of 408 in 51497905.

Moving on to step 1:
If we divide 5 by 408, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 408

Advancing to step 2:
408 can be fit into 51 0 times, resulting in a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Grab the next digit (4) from the dividend, add it to 51, then carry on: 514 / 408

Step 3:
If we divide 514 by 408, we get 1 and a remainder of 106.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 106 after subtracting 408 from 514.
Append the next digit (9) from the dividend to 106 and continue with: 1069 / 408

Let's proceed to step 4:
If we divide 1069 by 408, we get 2 and a remainder of 253.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtracting 816 from 1069 leaves us with 253.
Include the next digit (7) from the dividend after 253, then repeat: 2537 / 408

On to step 5:
If we divide 2537 by 408, we get 6 and a remainder of 89.
Put 6 as the next digit of the answer. 
Result so far: 126.0
Subtracting 2448 from 2537 leaves us with 89.
Bring next digit (9) of the dividend behind the 89 and repeat the process: 899 / 408

Step 6:
408 goes into 899 2 times with a remainder of 83.
The number 2 becomes the next digit in our result. 
Result so far: 1262.0
Subtracting 816 from 899 leaves us with 83.
Bring next digit (0) of the dividend behind the 83 and repeat the process: 830 / 408

Advancing to step 7:
If we divide 830 by 408, we get 2 and a remainder of 14.
The next digit of our result is 2. 
Result so far: 12622.0
The remainder is 14 after subtracting 816 from 830.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 408

Moving on to step 8:
408 can be fit into 145 0 times, resulting in a remainder of 145.
The next digit of our result is 0. 
Result so far: 126220.0
Deduct 0 from 145 and we're left with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Advancing to step 9:
If we divide 1450 by 408, we get 3 and a remainder of 226.
The next digit of our result is 3. 
Result so far: 126220.3
Deduct 1224 from 1450 and we're left with 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Going ahead to step 10:
When dividing 2260 by 408, we get 5 with a remainder of 220.
Write down 5 as next digit of the result. 
Result so far: 126220.35
Subtracting 2040 from 2260 leaves us with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Moving on to step 11:
408 goes into 2200 5 times with a remainder of 160.
Record the quotient 5 as the next digit in the result. 
Result so far: 126220.355
Subtracting 2040 from 2200 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

The final result is 126220.355 with a remainder of 0.016.