We look at the division of 41223808 by 646 
The aim is to understand the frequency of 646 in 41223808.

Advancing to step 1:
646 can be fit into 4 0 times, resulting in a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 646

Step 2:
646 can be fit into 41 0 times, resulting in a remainder of 41.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 41 to get 41.
Append the next digit (2) from the dividend to 41 and continue with: 412 / 646

Advancing to step 3:
412 divided by 646 is 0 with a remainder of 412.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 412 and we're left with 412.
Take the next digit (2) from the dividend and append it to 412, then repeat: 4122 / 646

Moving on to step 4:
If we divide 4122 by 646, we get 6 and a remainder of 246.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we subtract 3876 from 4122, we get 246.
Take the next digit (3) from the dividend and append it to 246, then repeat: 2463 / 646

Going ahead to step 5:
646 can be fit into 2463 3 times, resulting in a remainder of 525.
The number 3 becomes the next digit in our result. 
Result so far: 63.0
Deduct 1938 from 2463 and we're left with 525.
Fetch the next digit (8) from the dividend, attach it to 525 and continue: 5258 / 646

Advancing to step 6:
When dividing 5258 by 646, we get 8 with a remainder of 90.
Record the quotient 8 as the next digit in the result. 
Result so far: 638.0
If we subtract 5168 from 5258, we get 90.
Bring next digit (0) of the dividend behind the 90 and repeat the process: 900 / 646

Moving on to step 7:
900 divided by 646 is 1 with a remainder of 254.
Use 1 as the next digit of our solution. 
Result so far: 6381.0
If we subtract 646 from 900, we get 254.
Fetch the next digit (8) from the dividend, attach it to 254 and continue: 2548 / 646

Let's proceed to step 8:
2548 divided by 646 is 3 with a remainder of 610.
Use 3 as the next digit of our solution. 
Result so far: 63813.0
Deduct 1938 from 2548 and we're left with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

Moving on to step 9:
The number 646 fits into 6100 9 times, leaving a remainder of 286.
Write down 9 as next digit of the result. 
Result so far: 63813.9
If we take 5814 away from 6100, we end up with 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:
646 can be fit into 2860 4 times, resulting in a remainder of 276.
Write down 4 as next digit of the result. 
Result so far: 63813.94
If we subtract 2584 from 2860, we get 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Step 11:
646 goes into 2760 4 times with a remainder of 176.
Record the quotient 4 as the next digit in the result. 
Result so far: 63813.944
Subtract 2584 from 2760 to get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

The final result is 63813.944 with a remainder of 0.0176.