We look at the division of 640825 by 51 
The aim is to understand the frequency of 51 in 640825.

Advancing to step 1:
The number 51 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
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

Step 2:
51 can be fit into 64 1 times, resulting in a remainder of 13.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 51 from 64 and we're left with 13.
Include the next digit (0) from the dividend after 13, then repeat: 130 / 51

Let's proceed to step 3:
If we divide 130 by 51, we get 2 and a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 102 from 130 leaves us with 28.
Append the next digit (8) from the dividend to 28 and continue with: 288 / 51

On to step 4:
When dividing 288 by 51, we get 5 with a remainder of 33.
Use 5 as the next digit of our solution. 
Result so far: 125.0
Subtracting 255 from 288 leaves us with 33.
Append the next digit (2) from the dividend to 33 and continue with: 332 / 51

Going ahead to step 5:
51 can be fit into 332 6 times, resulting in a remainder of 26.
The next digit of our result is 6. 
Result so far: 1256.0
Deduct 306 from 332 and we're left with 26.
Include the next digit (5) from the dividend after 26, then repeat: 265 / 51

Moving on to step 6:
265 divided by 51 is 5 with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 12565.0
If we take 255 away from 265, we end up 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.

Moving on to step 7:
100 divided by 51 is 1 with a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 12565.1
If we take 51 away from 100, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 8:
490 divided by 51 is 9 with a remainder of 31.
Record the quotient 9 as the next digit in the result. 
Result so far: 12565.19
The remainder is 31 after subtracting 459 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 9:
When dividing 310 by 51, we get 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 12565.196
Deduct 306 from 310 and we're left with 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 10:
The number 51 fits into 40 0 times, leaving a remainder of 40.
The next digit of our result is 0. 
Result so far: 12565.196
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 11:
The number 51 fits into 400 7 times, leaving a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 12565.19607
Subtracting 357 from 400 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 12:
430 divided by 51 is 8 with a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 12565.196078
If we subtract 408 from 430, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 13:
51 can be fit into 220 4 times, resulting in a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 12565.1960784
Subtracting 204 from 220 leaves us with 16.
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 14:
51 can be fit into 160 3 times, resulting in a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 12565.19607843
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.

In conclusion, the division gives 12565.19607843 with a balance of 7e-09.