We look at the division of 80308846 by 646 
The aim is to understand the frequency of 646 in 80308846.

Advancing to step 1:
The number 646 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 646

Step 2:
646 goes into 80 0 times with a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 80 after subtracting 0 from 80.
Include the next digit (3) from the dividend after 80, then repeat: 803 / 646

Let's proceed to step 3:
The number 646 fits into 803 1 times, leaving a remainder of 157.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 646 away from 803, we end up with 157.
Append the next digit (0) from the dividend to 157 and continue with: 1570 / 646

Advancing to step 4:
646 can be fit into 1570 2 times, resulting in a remainder of 278.
The next digit of our result is 2. 
Result so far: 12.0
The remainder is 278 after subtracting 1292 from 1570.
Append the next digit (8) from the dividend to 278 and continue with: 2788 / 646

Step 5:
When dividing 2788 by 646, we get 4 with a remainder of 204.
Write down 4 as next digit of the result. 
Result so far: 124.0
Subtract 2584 from 2788 to get 204.
Include the next digit (8) from the dividend after 204, then repeat: 2048 / 646

On to step 6:
646 can be fit into 2048 3 times, resulting in a remainder of 110.
Use 3 as the next digit of our solution. 
Result so far: 1243.0
Subtract 1938 from 2048 to get 110.
Include the next digit (4) from the dividend after 110, then repeat: 1104 / 646

Step 7:
The number 646 fits into 1104 1 times, leaving a remainder of 458.
Use 1 as the next digit of our solution. 
Result so far: 12431.0
Subtracting 646 from 1104 leaves us with 458.
Grab the next digit (6) from the dividend, add it to 458, then carry on: 4586 / 646

Moving on to step 8:
The number 646 fits into 4586 7 times, leaving a remainder of 64.
Write down 7 as next digit of the result. 
Result so far: 124317.0
If we take 4522 away from 4586, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 9:
640 divided by 646 is 0 with a remainder of 640.
Write down 0 as next digit of the result. 
Result so far: 124317.0
If we subtract 0 from 640, we get 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Advancing to step 10:
The number 646 fits into 6400 9 times, leaving a remainder of 586.
Write down 9 as next digit of the result. 
Result so far: 124317.09
Subtracting 5814 from 6400 leaves us with 586.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5860, and continue the process.

On to step 11:
5860 divided by 646 is 9 with a remainder of 46.
Write down 9 as next digit of the result. 
Result so far: 124317.099
Subtract 5814 from 5860 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

After the division, we end up with 124317.099 and a remainder of 0.0046.