We look at the division of 365973 by 51 
The aim is to understand the frequency of 51 in 365973.

Going ahead to step 1:
3 divided by 51 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 51

Step 2:
If we divide 36 by 51, we get 0 and a remainder of 36.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 36 after subtracting 0 from 36.
Append the next digit (5) from the dividend to 36 and continue with: 365 / 51

On to step 3:
51 can be fit into 365 7 times, resulting in a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
If we take 357 away from 365, we end up with 8.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 51

Going ahead to step 4:
89 divided by 51 is 1 with a remainder of 38.
The next digit of our result is 1. 
Result so far: 71.0
If we subtract 51 from 89, we get 38.
Include the next digit (7) from the dividend after 38, then repeat: 387 / 51

Moving on to step 5:
The number 51 fits into 387 7 times, leaving a remainder of 30.
Record the quotient 7 as the next digit in the result. 
Result so far: 717.0
The remainder is 30 after subtracting 357 from 387.
Take the next digit (3) from the dividend and append it to 30, then repeat: 303 / 51

Let's proceed to step 6:
51 goes into 303 5 times with a remainder of 48.
Put 5 as the next digit of the answer. 
Result so far: 7175.0
If we take 255 away from 303, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 7:
If we divide 480 by 51, we get 9 and a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 7175.9
Subtracting 459 from 480 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 8:
If we divide 210 by 51, we get 4 and a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 7175.94
The remainder is 6 after subtracting 204 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
When dividing 60 by 51, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 7175.941
Subtract 51 from 60 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 10:
51 goes into 90 1 times with a remainder of 39.
The next digit of our result is 1. 
Result so far: 7175.9411
Subtracting 51 from 90 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final result is 7175.9411 with a remainder of 0.00039.