We look at the division of 305595 by 51 
The aim is to understand the frequency of 51 in 305595.

Step 1:
When dividing 3 by 51, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 51

Going ahead to step 2:
When dividing 30 by 51, we get 0 with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 30 leaves us with 30.
Include the next digit (5) from the dividend after 30, then repeat: 305 / 51

Going ahead to step 3:
51 can be fit into 305 5 times, resulting in a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
Deduct 255 from 305 and we're left with 50.
Take the next digit (5) from the dividend and append it to 50, then repeat: 505 / 51

Step 4:
When dividing 505 by 51, we get 9 with a remainder of 46.
Record the quotient 9 as the next digit in the result. 
Result so far: 59.0
If we take 459 away from 505, we end up with 46.
Grab the next digit (9) from the dividend, add it to 46, then carry on: 469 / 51

Step 5:
51 can be fit into 469 9 times, resulting in a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 599.0
If we take 459 away from 469, we end up with 10.
Include the next digit (5) from the dividend after 10, then repeat: 105 / 51

Moving on to step 6:
51 goes into 105 2 times with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 5992.0
The remainder is 3 after subtracting 102 from 105.
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:
The number 51 fits into 30 0 times, leaving a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 5992.0
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 8:
The number 51 fits into 300 5 times, leaving a remainder of 45.
The next digit of our result is 5. 
Result so far: 5992.05
If we subtract 255 from 300, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 9:
51 goes into 450 8 times with a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 5992.058
If we take 408 away from 450, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 10:
51 can be fit into 420 8 times, resulting in a remainder of 12.
The next digit of our result is 8. 
Result so far: 5992.0588
Deduct 408 from 420 and we're left 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.

The final result is 5992.0588 with a remainder of 0.00012.