612713 ÷ 51 
The aim is to understand the frequency of 51 in 612713.

Advancing 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
Subtracting 0 from 6 leaves us with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 51

Moving on to step 2:
61 divided by 51 is 1 with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 51 from 61, we get 10.
Fetch the next digit (2) from the dividend, attach it to 10 and continue: 102 / 51

Going ahead to step 3:
The number 51 fits into 102 2 times, leaving a remainder of 0.
The next digit of our result is 2. 
Result so far: 12.0
If we take 102 away from 102, we end up with 0.
Take the next digit (7) from the dividend and append it to 0, then repeat: 7 / 51

Let's proceed to step 4:
If we divide 7 by 51, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 120.0
Subtract 0 from 7 to get 7.
Fetch the next digit (1) from the dividend, attach it to 7 and continue: 71 / 51

On to step 5:
51 can be fit into 71 1 times, resulting in a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 1201.0
If we take 51 away from 71, we end up with 20.
Bring next digit (3) of the dividend behind the 20 and repeat the process: 203 / 51

On to step 6:
203 divided by 51 is 3 with a remainder of 50.
The number 3 becomes the next digit in our result. 
Result so far: 12013.0
The remainder is 50 after subtracting 153 from 203.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 7:
51 can be fit into 500 9 times, resulting in a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 12013.9
If we take 459 away from 500, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 8:
410 divided by 51 is 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 12013.98
If we take 408 away from 410, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 9:
20 divided by 51 is 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 12013.98
Subtract 0 from 20 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.

On to step 10:
When dividing 200 by 51, we get 3 with a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 12013.9803
If we take 153 away from 200, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Moving on to step 11:
51 goes into 470 9 times with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 12013.98039
If we take 459 away from 470, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 12:
When dividing 110 by 51, we get 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 12013.980392
If we subtract 102 from 110, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 13:
51 goes into 80 1 times with a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 12013.9803921
Subtracting 51 from 80 leaves us 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.

Step 14:
If we divide 290 by 51, we get 5 and a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 12013.98039215
If we subtract 255 from 290, we 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.

The final result is 12013.98039215 with a remainder of 3.5e-08.