Let's divide 646904 by 51
The aim is to understand the frequency of 51 in 646904.

Moving on to step 1:
51 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 51

Moving on to step 2:
51 can be fit into 64 1 times, resulting in a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 13 after subtracting 51 from 64.
Fetch the next digit (6) from the dividend, attach it to 13 and continue: 136 / 51

Step 3:
51 goes into 136 2 times with a remainder of 34.
Use 2 as the next digit of our solution. 
Result so far: 12.0
The remainder is 34 after subtracting 102 from 136.
Fetch the next digit (9) from the dividend, attach it to 34 and continue: 349 / 51

Moving on to step 4:
If we divide 349 by 51, we get 6 and a remainder of 43.
Write down 6 as next digit of the result. 
Result so far: 126.0
The remainder is 43 after subtracting 306 from 349.
Grab the next digit (0) from the dividend, add it to 43, then carry on: 430 / 51

Step 5:
430 divided by 51 is 8 with a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 1268.0
Subtracting 408 from 430 leaves us with 22.
Bring next digit (4) of the dividend behind the 22 and repeat the process: 224 / 51

Moving on to step 6:
224 divided by 51 is 4 with a remainder of 20.
The next digit of our result is 4. 
Result so far: 12684.0
Subtract 204 from 224 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 7:
The number 51 fits into 200 3 times, leaving a remainder of 47.
The next digit of our result is 3. 
Result so far: 12684.3
Subtract 153 from 200 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 8:
470 divided by 51 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 12684.39
Subtract 459 from 470 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 9:
The number 51 fits into 110 2 times, leaving a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 12684.392
Subtracting 102 from 110 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
80 divided by 51 is 1 with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 12684.3921
Deduct 51 from 80 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 11:
290 divided by 51 is 5 with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 12684.39215
Subtract 255 from 290 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 12:
51 can be fit into 350 6 times, resulting in a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 12684.392156
Subtract 306 from 350 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 13:
If we divide 440 by 51, we get 8 and a remainder of 32.
The next digit of our result is 8. 
Result so far: 12684.3921568
Subtract 408 from 440 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 14:
51 can be fit into 320 6 times, resulting in a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 12684.39215686
Subtracting 306 from 320 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Our division results in 12684.39215686 with a remaining 1.4e-08.