660080 divided by 51 
The aim is to understand the frequency of 51 in 660080.

On to step 1:
6 divided by 51 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 51

Step 2:
51 can be fit into 66 1 times, resulting in a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 51 away from 66, we end up with 15.
Bring next digit (0) of the dividend behind the 15 and repeat the process: 150 / 51

Step 3:
51 can be fit into 150 2 times, resulting in a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we take 102 away from 150, we end up with 48.
Append the next digit (0) from the dividend to 48 and continue with: 480 / 51

Let's proceed to step 4:
51 can be fit into 480 9 times, resulting in a remainder of 21.
The number 9 becomes the next digit in our result. 
Result so far: 129.0
Subtracting 459 from 480 leaves us with 21.
Take the next digit (8) from the dividend and append it to 21, then repeat: 218 / 51

Moving on to step 5:
218 divided by 51 is 4 with a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 1294.0
Deduct 204 from 218 and we're left with 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 51

Advancing to step 6:
51 can be fit into 140 2 times, resulting in a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 12942.0
If we take 102 away from 140, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 7:
The number 51 fits into 380 7 times, leaving a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 12942.7
Deduct 357 from 380 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 8:
51 goes into 230 4 times with a remainder of 26.
The next digit of our result is 4. 
Result so far: 12942.74
The remainder is 26 after subtracting 204 from 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 9:
When dividing 260 by 51, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 12942.745
Subtracting 255 from 260 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 10:
When dividing 50 by 51, we get 0 with a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 12942.745
Deduct 0 from 50 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 11:
500 divided by 51 is 9 with a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 12942.74509
The remainder is 41 after subtracting 459 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 12:
410 divided by 51 is 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 12942.745098
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.

Advancing to step 13:
The number 51 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 12942.745098
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
200 divided by 51 is 3 with a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 12942.74509803
Deduct 153 from 200 and we're left 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.

In conclusion, the division gives 12942.74509803 with a balance of 4.7e-08.