651969 ÷ 91 
The aim is to understand the frequency of 91 in 651969.

Moving on to step 1:
When dividing 6 by 91, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 91

Moving on to step 2:
When dividing 65 by 91, we get 0 with a remainder of 65.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 65 to get 65.
Grab the next digit (1) from the dividend, add it to 65, then carry on: 651 / 91

Going ahead to step 3:
651 divided by 91 is 7 with a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtract 637 from 651 to get 14.
Append the next digit (9) from the dividend to 14 and continue with: 149 / 91

Step 4:
91 can be fit into 149 1 times, resulting in a remainder of 58.
Put 1 as the next digit of the answer. 
Result so far: 71.0
If we take 91 away from 149, we end up with 58.
Bring next digit (6) of the dividend behind the 58 and repeat the process: 586 / 91

Going ahead to step 5:
When dividing 586 by 91, we get 6 with a remainder of 40.
The next digit of our result is 6. 
Result so far: 716.0
Deduct 546 from 586 and we're left with 40.
Take the next digit (9) from the dividend and append it to 40, then repeat: 409 / 91

Going ahead to step 6:
When dividing 409 by 91, we get 4 with a remainder of 45.
The number 4 becomes the next digit in our result. 
Result so far: 7164.0
The remainder is 45 after subtracting 364 from 409.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 7:
91 can be fit into 450 4 times, resulting in a remainder of 86.
The next digit of our result is 4. 
Result so far: 7164.4
The remainder is 86 after subtracting 364 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Going ahead to step 8:
860 divided by 91 is 9 with a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 7164.49
Subtracting 819 from 860 leaves us 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.

Going ahead to step 9:
410 divided by 91 is 4 with a remainder of 46.
The next digit of our result is 4. 
Result so far: 7164.494
If we take 364 away from 410, we end up with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Step 10:
When dividing 460 by 91, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 7164.4945
The remainder is 5 after subtracting 455 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 11:
91 goes into 50 0 times with a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 7164.4945
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 12:
If we divide 500 by 91, we get 5 and a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 7164.494505
If we take 455 away from 500, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 13:
450 divided by 91 is 4 with a remainder of 86.
The next digit of our result is 4. 
Result so far: 7164.4945054
If we subtract 364 from 450, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 14:
When dividing 860 by 91, we get 9 with a remainder of 41.
Put 9 as the next digit of the answer. 
Result so far: 7164.49450549
The remainder is 41 after subtracting 819 from 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

After the division, we end up with 7164.49450549 and a remainder of 4.1e-08.