Let's divide 961891 by 51
The aim is to understand the frequency of 51 in 961891.

Moving on to step 1:
When dividing 9 by 51, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 51

Moving on to step 2:
The number 51 fits into 96 1 times, leaving a remainder of 45.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 51 from 96 to get 45.
Bring next digit (1) of the dividend behind the 45 and repeat the process: 451 / 51

Step 3:
The number 51 fits into 451 8 times, leaving a remainder of 43.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
Subtracting 408 from 451 leaves us with 43.
Append the next digit (8) from the dividend to 43 and continue with: 438 / 51

Moving on to step 4:
The number 51 fits into 438 8 times, leaving a remainder of 30.
Record the quotient 8 as the next digit in the result. 
Result so far: 188.0
Subtracting 408 from 438 leaves us with 30.
Include the next digit (9) from the dividend after 30, then repeat: 309 / 51

Moving on to step 5:
The number 51 fits into 309 6 times, leaving a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 1886.0
If we subtract 306 from 309, we get 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 51

Let's proceed to step 6:
31 divided by 51 is 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 18860.0
If we take 0 away from 31, we end up with 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:
The number 51 fits into 310 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 18860.6
The remainder is 4 after subtracting 306 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
If we divide 40 by 51, we get 0 and a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 18860.6
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 9:
51 can be fit into 400 7 times, resulting in a remainder of 43.
The number 7 becomes the next digit in our result. 
Result so far: 18860.607
Subtract 357 from 400 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 10:
If we divide 430 by 51, we get 8 and a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 18860.6078
Subtract 408 from 430 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 11:
220 divided by 51 is 4 with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 18860.60784
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.

Let's proceed to step 12:
160 divided by 51 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 18860.607843
Deduct 153 from 160 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 13:
70 divided by 51 is 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 18860.6078431
Subtracting 51 from 70 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 14:
51 goes into 190 3 times with a remainder of 37.
Record the quotient 3 as the next digit in the result. 
Result so far: 18860.60784313
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.

The final outcome is 18860.60784313, with a leftover of 3.7e-08.