We look at the division of 704517 by 51 
The aim is to understand the frequency of 51 in 704517.

Step 1:
7 divided by 51 is 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 51

Let's proceed to step 2:
If we divide 70 by 51, we get 1 and a remainder of 19.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 51 from 70 to get 19.
Include the next digit (4) from the dividend after 19, then repeat: 194 / 51

Going ahead to step 3:
The number 51 fits into 194 3 times, leaving a remainder of 41.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we take 153 away from 194, we end up with 41.
Bring next digit (5) of the dividend behind the 41 and repeat the process: 415 / 51

Advancing to step 4:
When dividing 415 by 51, we get 8 with a remainder of 7.
The number 8 becomes the next digit in our result. 
Result so far: 138.0
Subtract 408 from 415 to get 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 51

Step 5:
51 can be fit into 71 1 times, resulting in a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 1381.0
Subtract 51 from 71 to get 20.
Grab the next digit (7) from the dividend, add it to 20, then carry on: 207 / 51

On to step 6:
If we divide 207 by 51, we get 4 and a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 13814.0
If we take 204 away from 207, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
If we divide 30 by 51, we get 0 and a remainder of 30.
The next digit of our result is 0. 
Result so far: 13814.0
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 8:
The number 51 fits into 300 5 times, leaving a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 13814.05
Subtracting 255 from 300 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 9:
When dividing 450 by 51, we get 8 with a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 13814.058
If we subtract 408 from 450, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 10:
51 goes into 420 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 13814.0588
Subtracting 408 from 420 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 13814.0588 and a remainder of 0.00012.