We're dividing 434987 by 51 
The aim is to understand the frequency of 51 in 434987.

Step 1:
51 goes into 4 0 times with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 51

On to step 2:
51 can be fit into 43 0 times, resulting in a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Take the next digit (4) from the dividend and append it to 43, then repeat: 434 / 51

On to step 3:
434 divided by 51 is 8 with a remainder of 26.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 408 from 434 to get 26.
Grab the next digit (9) from the dividend, add it to 26, then carry on: 269 / 51

On to step 4:
51 can be fit into 269 5 times, resulting in a remainder of 14.
Put 5 as the next digit of the answer. 
Result so far: 85.0
Deduct 255 from 269 and we're left with 14.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 51

Let's proceed to step 5:
148 divided by 51 is 2 with a remainder of 46.
Put 2 as the next digit of the answer. 
Result so far: 852.0
Subtract 102 from 148 to get 46.
Bring next digit (7) of the dividend behind the 46 and repeat the process: 467 / 51

Advancing to step 6:
467 divided by 51 is 9 with a remainder of 8.
The next digit of our result is 9. 
Result so far: 8529.0
If we take 459 away from 467, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 7:
80 divided by 51 is 1 with a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 8529.1
Subtracting 51 from 80 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 8:
290 divided by 51 is 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 8529.15
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.

Moving on to step 9:
350 divided by 51 is 6 with a remainder of 44.
The next digit of our result is 6. 
Result so far: 8529.156
The remainder is 44 after subtracting 306 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 10:
51 can be fit into 440 8 times, resulting in a remainder of 32.
The next digit of our result is 8. 
Result so far: 8529.1568
Subtracting 408 from 440 leaves us 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.

Moving on to step 11:
The number 51 fits into 320 6 times, leaving a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 8529.15686
Subtract 306 from 320 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 12:
If we divide 140 by 51, we get 2 and a remainder of 38.
The number 2 becomes the next digit in our result. 
Result so far: 8529.156862
Subtracting 102 from 140 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 13:
If we divide 380 by 51, we get 7 and a remainder of 23.
The next digit of our result is 7. 
Result so far: 8529.1568627
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.

Advancing to step 14:
51 can be fit into 230 4 times, resulting in a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 8529.15686274
If we subtract 204 from 230, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

The final result is 8529.15686274 with a remainder of 2.6e-08.