Let's divide 64230761 by 646
The aim is to understand the frequency of 646 in 64230761.

On to step 1:
646 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 646

Going ahead to step 2:
The number 646 fits into 64 0 times, leaving a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Include the next digit (2) from the dividend after 64, then repeat: 642 / 646

Step 3:
646 goes into 642 0 times with a remainder of 642.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 642 leaves us with 642.
Grab the next digit (3) from the dividend, add it to 642, then carry on: 6423 / 646

Let's proceed to step 4:
646 can be fit into 6423 9 times, resulting in a remainder of 609.
The next digit of our result is 9. 
Result so far: 9.0
The remainder is 609 after subtracting 5814 from 6423.
Include the next digit (0) from the dividend after 609, then repeat: 6090 / 646

On to step 5:
The number 646 fits into 6090 9 times, leaving a remainder of 276.
The next digit of our result is 9. 
Result so far: 99.0
If we take 5814 away from 6090, we end up with 276.
Include the next digit (7) from the dividend after 276, then repeat: 2767 / 646

Going ahead to step 6:
646 goes into 2767 4 times with a remainder of 183.
Record the quotient 4 as the next digit in the result. 
Result so far: 994.0
Subtract 2584 from 2767 to get 183.
Bring next digit (6) of the dividend behind the 183 and repeat the process: 1836 / 646

Step 7:
The number 646 fits into 1836 2 times, leaving a remainder of 544.
Record the quotient 2 as the next digit in the result. 
Result so far: 9942.0
If we subtract 1292 from 1836, we get 544.
Include the next digit (1) from the dividend after 544, then repeat: 5441 / 646

Moving on to step 8:
646 can be fit into 5441 8 times, resulting in a remainder of 273.
Use 8 as the next digit of our solution. 
Result so far: 99428.0
Deduct 5168 from 5441 and we're left with 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

Going ahead to step 9:
646 can be fit into 2730 4 times, resulting in a remainder of 146.
Use 4 as the next digit of our solution. 
Result so far: 99428.4
If we subtract 2584 from 2730, we get 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Advancing to step 10:
646 goes into 1460 2 times with a remainder of 168.
The next digit of our result is 2. 
Result so far: 99428.42
The remainder is 168 after subtracting 1292 from 1460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Advancing to step 11:
1680 divided by 646 is 2 with a remainder of 388.
Write down 2 as next digit of the result. 
Result so far: 99428.422
If we take 1292 away from 1680, we end up with 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

After the division, we end up with 99428.422 and a remainder of 0.0388.