Let's divide 862391 by 51
The aim is to understand the frequency of 51 in 862391.

Moving on to step 1:
8 divided by 51 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 51

Moving on to step 2:
86 divided by 51 is 1 with a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 51 from 86 and we're left with 35.
Include the next digit (2) from the dividend after 35, then repeat: 352 / 51

Step 3:
If we divide 352 by 51, we get 6 and a remainder of 46.
Write down 6 as next digit of the result. 
Result so far: 16.0
If we subtract 306 from 352, we get 46.
Bring next digit (3) of the dividend behind the 46 and repeat the process: 463 / 51

Moving on to step 4:
51 goes into 463 9 times with a remainder of 4.
Put 9 as the next digit of the answer. 
Result so far: 169.0
The remainder is 4 after subtracting 459 from 463.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 51

Going ahead to step 5:
If we divide 49 by 51, we get 0 and a remainder of 49.
Use 0 as the next digit of our solution. 
Result so far: 1690.0
If we take 0 away from 49, we end up with 49.
Grab the next digit (1) from the dividend, add it to 49, then carry on: 491 / 51

Advancing to step 6:
If we divide 491 by 51, we get 9 and a remainder of 32.
Record the quotient 9 as the next digit in the result. 
Result so far: 16909.0
Subtracting 459 from 491 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.

Advancing to step 7:
The number 51 fits into 320 6 times, leaving a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 16909.6
The remainder is 14 after subtracting 306 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
The number 51 fits into 140 2 times, leaving a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 16909.62
If we subtract 102 from 140, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 9:
The number 51 fits into 380 7 times, leaving a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 16909.627
The remainder is 23 after subtracting 357 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 10:
51 can be fit into 230 4 times, resulting in a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 16909.6274
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.

Moving on to step 11:
When dividing 260 by 51, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 16909.62745
Subtracting 255 from 260 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 12:
50 divided by 51 is 0 with a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 16909.62745
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 13:
If we divide 500 by 51, we get 9 and a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 16909.6274509
Deduct 459 from 500 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 14:
410 divided by 51 is 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 16909.62745098
Subtract 408 from 410 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 16909.62745098, with a leftover of 2e-09.