598731 divided by 51 
The aim is to understand the frequency of 51 in 598731.

Step 1:
The number 51 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 51

Advancing to step 2:
When dividing 59 by 51, we get 1 with a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 51 from 59 and we're left with 8.
Bring next digit (8) of the dividend behind the 8 and repeat the process: 88 / 51

Let's proceed to step 3:
When dividing 88 by 51, we get 1 with a remainder of 37.
Put 1 as the next digit of the answer. 
Result so far: 11.0
The remainder is 37 after subtracting 51 from 88.
Grab the next digit (7) from the dividend, add it to 37, then carry on: 377 / 51

Going ahead to step 4:
377 divided by 51 is 7 with a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 117.0
The remainder is 20 after subtracting 357 from 377.
Grab the next digit (3) from the dividend, add it to 20, then carry on: 203 / 51

Let's proceed to step 5:
The number 51 fits into 203 3 times, leaving a remainder of 50.
Write down 3 as next digit of the result. 
Result so far: 1173.0
The remainder is 50 after subtracting 153 from 203.
Grab the next digit (1) from the dividend, add it to 50, then carry on: 501 / 51

Moving on to step 6:
51 goes into 501 9 times with a remainder of 42.
The number 9 becomes the next digit in our result. 
Result so far: 11739.0
Subtracting 459 from 501 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.

Step 7:
420 divided by 51 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 11739.8
Subtracting 408 from 420 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
The number 51 fits into 120 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 11739.82
The remainder is 18 after subtracting 102 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
51 goes into 180 3 times with a remainder of 27.
The number 3 becomes the next digit in our result. 
Result so far: 11739.823
Deduct 153 from 180 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 10:
270 divided by 51 is 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 11739.8235
Subtracting 255 from 270 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 11:
When dividing 150 by 51, we get 2 with a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 11739.82352
If we subtract 102 from 150, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 12:
When dividing 480 by 51, we get 9 with a remainder of 21.
The next digit of our result is 9. 
Result so far: 11739.823529
Subtract 459 from 480 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 13:
210 divided by 51 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 11739.8235294
Deduct 204 from 210 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 14:
When dividing 60 by 51, we get 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 11739.82352941
Subtracting 51 from 60 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

The final outcome is 11739.82352941, with a leftover of 9e-09.