We look at the division of 643279 by 51 
The aim is to understand the frequency of 51 in 643279.

Going ahead to step 1:
When dividing 6 by 51, we get 0 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.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 51

Advancing to step 2:
51 can be fit into 64 1 times, resulting in a remainder of 13.
The next digit of our result is 1. 
Result so far: 1.0
If we take 51 away from 64, we end up with 13.
Bring next digit (3) of the dividend behind the 13 and repeat the process: 133 / 51

On to step 3:
If we divide 133 by 51, we get 2 and a remainder of 31.
Write down 2 as next digit of the result. 
Result so far: 12.0
Deduct 102 from 133 and we're left with 31.
Bring next digit (2) of the dividend behind the 31 and repeat the process: 312 / 51

Advancing to step 4:
If we divide 312 by 51, we get 6 and a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 126.0
If we subtract 306 from 312, we get 6.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 51

Moving on to step 5:
51 goes into 67 1 times with a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 1261.0
Subtracting 51 from 67 leaves us with 16.
Bring next digit (9) of the dividend behind the 16 and repeat the process: 169 / 51

Step 6:
51 goes into 169 3 times with a remainder of 16.
The next digit of our result is 3. 
Result so far: 12613.0
If we take 153 away from 169, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 7:
51 can be fit into 160 3 times, resulting in a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 12613.3
Subtract 153 from 160 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 8:
When dividing 70 by 51, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 12613.31
Deduct 51 from 70 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 9:
The number 51 fits into 190 3 times, leaving a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 12613.313
Subtracting 153 from 190 leaves us with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 10:
51 can be fit into 370 7 times, resulting in a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 12613.3137
If we subtract 357 from 370, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 11:
When dividing 130 by 51, we get 2 with a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 12613.31372
Deduct 102 from 130 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 12:
51 goes into 280 5 times with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 12613.313725
The remainder is 25 after subtracting 255 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 13:
When dividing 250 by 51, we get 4 with a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 12613.3137254
If we subtract 204 from 250, we 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.

Going ahead to step 14:
460 divided by 51 is 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 12613.31372549
If we take 459 away from 460, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 12613.31372549 and a remainder of 1e-09.