Let's divide 903999 by 51
The aim is to understand the frequency of 51 in 903999.

Let's proceed to step 1:
9 divided by 51 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 51

Let's proceed to step 2:
The number 51 fits into 90 1 times, leaving a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 51 away from 90, we end up with 39.
Bring next digit (3) of the dividend behind the 39 and repeat the process: 393 / 51

On to step 3:
393 divided by 51 is 7 with a remainder of 36.
Use 7 as the next digit of our solution. 
Result so far: 17.0
Subtract 357 from 393 to get 36.
Append the next digit (9) from the dividend to 36 and continue with: 369 / 51

Let's proceed to step 4:
51 can be fit into 369 7 times, resulting in a remainder of 12.
The next digit of our result is 7. 
Result so far: 177.0
Subtract 357 from 369 to get 12.
Include the next digit (9) from the dividend after 12, then repeat: 129 / 51

Advancing to step 5:
129 divided by 51 is 2 with a remainder of 27.
The next digit of our result is 2. 
Result so far: 1772.0
The remainder is 27 after subtracting 102 from 129.
Bring next digit (9) of the dividend behind the 27 and repeat the process: 279 / 51

Step 6:
When dividing 279 by 51, we get 5 with a remainder of 24.
The next digit of our result is 5. 
Result so far: 17725.0
Subtracting 255 from 279 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 7:
51 goes into 240 4 times with a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 17725.4
If we take 204 away from 240, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 8:
The number 51 fits into 360 7 times, leaving a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 17725.47
If we take 357 away from 360, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 9:
30 divided by 51 is 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 17725.47
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 10:
51 goes into 300 5 times with a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 17725.4705
If we subtract 255 from 300, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 11:
If we divide 450 by 51, we get 8 and a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 17725.47058
Subtracting 408 from 450 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 12:
51 can be fit into 420 8 times, resulting in a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 17725.470588
The remainder is 12 after subtracting 408 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Our division results in 17725.470588 with a remaining 1.2e-06.