We're dividing 215785 by 51 
The aim is to understand the frequency of 51 in 215785.

Advancing to step 1:
When dividing 2 by 51, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 51

Advancing to step 2:
51 can be fit into 21 0 times, resulting in a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Take the next digit (5) from the dividend and append it to 21, then repeat: 215 / 51

Let's proceed to step 3:
51 goes into 215 4 times with a remainder of 11.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 204 away from 215, we end up with 11.
Include the next digit (7) from the dividend after 11, then repeat: 117 / 51

Advancing to step 4:
51 can be fit into 117 2 times, resulting in a remainder of 15.
The next digit of our result is 2. 
Result so far: 42.0
The remainder is 15 after subtracting 102 from 117.
Grab the next digit (8) from the dividend, add it to 15, then carry on: 158 / 51

Step 5:
If we divide 158 by 51, we get 3 and a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 423.0
Subtracting 153 from 158 leaves us with 5.
Include the next digit (5) from the dividend after 5, then repeat: 55 / 51

On to step 6:
The number 51 fits into 55 1 times, leaving a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 4231.0
If we subtract 51 from 55, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
40 divided by 51 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 4231.0
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 8:
51 goes into 400 7 times with a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 4231.07
Subtract 357 from 400 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 9:
When dividing 430 by 51, we get 8 with a remainder of 22.
The next digit of our result is 8. 
Result so far: 4231.078
If we take 408 away from 430, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 10:
220 divided by 51 is 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 4231.0784
The remainder is 16 after subtracting 204 from 220.
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 11:
51 can be fit into 160 3 times, resulting in a remainder of 7.
The next digit of our result is 3. 
Result so far: 4231.07843
If we take 153 away from 160, we end up with 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 12:
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: 4231.078431
If we take 51 away from 70, we end up 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.

Moving on to step 13:
The number 51 fits into 190 3 times, leaving a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 4231.0784313
Deduct 153 from 190 and we're left 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.

Let's proceed to step 14:
51 goes into 370 7 times with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 4231.07843137
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.

The final outcome is 4231.07843137, with a leftover of 1.3e-08.