We look at the division of 66994580 by 51 
The aim is to understand the frequency of 51 in 66994580.

Advancing to step 1:
The number 51 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 51

Let's proceed to step 2:
If we divide 66 by 51, we get 1 and a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 51 from 66 leaves us with 15.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 51

On to step 3:
When dividing 159 by 51, we get 3 with a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 153 from 159, we get 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 51

Moving on to step 4:
51 goes into 69 1 times with a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 131.0
Deduct 51 from 69 and we're left with 18.
Fetch the next digit (4) from the dividend, attach it to 18 and continue: 184 / 51

Advancing to step 5:
The number 51 fits into 184 3 times, leaving a remainder of 31.
The next digit of our result is 3. 
Result so far: 1313.0
If we subtract 153 from 184, we get 31.
Fetch the next digit (5) from the dividend, attach it to 31 and continue: 315 / 51

Going ahead to step 6:
When dividing 315 by 51, we get 6 with a remainder of 9.
The number 6 becomes the next digit in our result. 
Result so far: 13136.0
Subtract 306 from 315 to get 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 51

Let's proceed to step 7:
When dividing 98 by 51, we get 1 with a remainder of 47.
The next digit of our result is 1. 
Result so far: 131361.0
Deduct 51 from 98 and we're left with 47.
Grab the next digit (0) from the dividend, add it to 47, then carry on: 470 / 51

On to step 8:
470 divided by 51 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 1313619.0
If we take 459 away from 470, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 9:
51 can be fit into 110 2 times, resulting in a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 1313619.2
The remainder is 8 after subtracting 102 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
If we divide 80 by 51, we get 1 and a remainder of 29.
The next digit of our result is 1. 
Result so far: 1313619.21
The remainder is 29 after subtracting 51 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 11:
51 can be fit into 290 5 times, resulting in a remainder of 35.
Record the quotient 5 as the next digit in the result. 
Result so far: 1313619.215
If we take 255 away from 290, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 12:
The number 51 fits into 350 6 times, leaving a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 1313619.2156
Subtracting 306 from 350 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 13:
51 can be fit into 440 8 times, resulting in a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 1313619.21568
If we take 408 away from 440, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 14:
320 divided by 51 is 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 1313619.215686
If we take 306 away from 320, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 15:
The number 51 fits into 140 2 times, leaving a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 1313619.2156862
The remainder is 38 after subtracting 102 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 16:
380 divided by 51 is 7 with a remainder of 23.
Use 7 as the next digit of our solution. 
Result so far: 1313619.21568627
If we subtract 357 from 380, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Our division results in 1313619.21568627 with a remaining 2.3e-08.