618862 ÷ 646 
The aim is to understand the frequency of 646 in 618862.

Let's proceed to step 1:
If we divide 6 by 646, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 646

Going ahead to step 2:
646 can be fit into 61 0 times, resulting in a remainder of 61.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 61, we get 61.
Include the next digit (8) from the dividend after 61, then repeat: 618 / 646

Advancing to step 3:
646 goes into 618 0 times with a remainder of 618.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 618 to get 618.
Grab the next digit (8) from the dividend, add it to 618, then carry on: 6188 / 646

Let's proceed to step 4:
646 goes into 6188 9 times with a remainder of 374.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 5814 from 6188 leaves us with 374.
Include the next digit (6) from the dividend after 374, then repeat: 3746 / 646

On to step 5:
3746 divided by 646 is 5 with a remainder of 516.
Use 5 as the next digit of our solution. 
Result so far: 95.0
If we take 3230 away from 3746, we end up with 516.
Include the next digit (2) from the dividend after 516, then repeat: 5162 / 646

On to step 6:
646 goes into 5162 7 times with a remainder of 640.
The next digit of our result is 7. 
Result so far: 957.0
If we take 4522 away from 5162, we end up with 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6400, and continue the process.

Step 7:
If we divide 6400 by 646, we get 9 and a remainder of 586.
Use 9 as the next digit of our solution. 
Result so far: 957.9
Subtract 5814 from 6400 to get 586.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5860, and continue the process.

Moving on to step 8:
646 can be fit into 5860 9 times, resulting in a remainder of 46.
Put 9 as the next digit of the answer. 
Result so far: 957.99
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.

The quotient of the division is 957.99, and the remainder is 0.046.