We look at the division of 640180 by 51 
The aim is to understand the frequency of 51 in 640180.

Step 1:
When dividing 6 by 51, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 51

Going ahead to step 2:
51 can be fit into 64 1 times, resulting in a remainder of 13.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 51 from 64 and we're left with 13.
Grab the next digit (0) from the dividend, add it to 13, then carry on: 130 / 51

Step 3:
130 divided by 51 is 2 with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtract 102 from 130 to get 28.
Append the next digit (1) from the dividend to 28 and continue with: 281 / 51

Let's proceed to step 4:
51 can be fit into 281 5 times, resulting in a remainder of 26.
The next digit of our result is 5. 
Result so far: 125.0
If we take 255 away from 281, we end up with 26.
Append the next digit (8) from the dividend to 26 and continue with: 268 / 51

Advancing to step 5:
51 can be fit into 268 5 times, resulting in a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 1255.0
Subtract 255 from 268 to get 13.
Grab the next digit (0) from the dividend, add it to 13, then carry on: 130 / 51

Moving on to step 6:
If we divide 130 by 51, we get 2 and a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 12552.0
Subtract 102 from 130 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 7:
51 can be fit into 280 5 times, resulting in a remainder of 25.
Record the quotient 5 as the next digit in the result. 
Result so far: 12552.5
Subtracting 255 from 280 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 8:
51 goes into 250 4 times with a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 12552.54
Subtracting 204 from 250 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Step 9:
460 divided by 51 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 12552.549
Subtracting 459 from 460 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 10:
51 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 12552.549
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 11:
51 can be fit into 100 1 times, resulting in a remainder of 49.
Use 1 as the next digit of our solution. 
Result so far: 12552.54901
Subtract 51 from 100 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 12:
The number 51 fits into 490 9 times, leaving a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 12552.549019
If we take 459 away from 490, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 13:
The number 51 fits into 310 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 12552.5490196
The remainder is 4 after subtracting 306 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 14:
51 goes into 40 0 times with a remainder of 40.
The next digit of our result is 0. 
Result so far: 12552.5490196
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

In conclusion, the division gives 12552.5490196 with a balance of 4e-08.