998509 ÷ 51 
The aim is to understand the frequency of 51 in 998509.

Going ahead to step 1:
When dividing 9 by 51, we get 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 51

Going ahead to step 2:
51 can be fit into 99 1 times, resulting in a remainder of 48.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 51 from 99 leaves us with 48.
Include the next digit (8) from the dividend after 48, then repeat: 488 / 51

Going ahead to step 3:
If we divide 488 by 51, we get 9 and a remainder of 29.
The next digit of our result is 9. 
Result so far: 19.0
If we subtract 459 from 488, we get 29.
Take the next digit (5) from the dividend and append it to 29, then repeat: 295 / 51

Going ahead to step 4:
The number 51 fits into 295 5 times, leaving a remainder of 40.
Record the quotient 5 as the next digit in the result. 
Result so far: 195.0
Subtracting 255 from 295 leaves us with 40.
Grab the next digit (0) from the dividend, add it to 40, then carry on: 400 / 51

Advancing to step 5:
When dividing 400 by 51, we get 7 with a remainder of 43.
The number 7 becomes the next digit in our result. 
Result so far: 1957.0
Subtract 357 from 400 to get 43.
Fetch the next digit (9) from the dividend, attach it to 43 and continue: 439 / 51

Let's proceed to step 6:
51 goes into 439 8 times with a remainder of 31.
The next digit of our result is 8. 
Result so far: 19578.0
Subtract 408 from 439 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Advancing to step 7:
51 can be fit into 310 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 19578.6
Subtracting 306 from 310 leaves us 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.

Going ahead to step 8:
51 goes into 40 0 times with a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 19578.6
Subtracting 0 from 40 leaves us 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 9:
400 divided by 51 is 7 with a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 19578.607
The remainder is 43 after subtracting 357 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Moving on to step 10:
If we divide 430 by 51, we get 8 and a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 19578.6078
Subtracting 408 from 430 leaves us with 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 11:
51 goes into 220 4 times with a remainder of 16.
The next digit of our result is 4. 
Result so far: 19578.60784
If we subtract 204 from 220, we get 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 12:
If we divide 160 by 51, we get 3 and a remainder of 7.
The next digit of our result is 3. 
Result so far: 19578.607843
If we subtract 153 from 160, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 13:
51 goes into 70 1 times with a remainder of 19.
The next digit of our result is 1. 
Result so far: 19578.6078431
Subtract 51 from 70 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 14:
51 goes into 190 3 times with a remainder of 37.
The next digit of our result is 3. 
Result so far: 19578.60784313
The remainder is 37 after subtracting 153 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

After the division, we end up with 19578.60784313 and a remainder of 3.7e-08.