143675 divided by 91 
The aim is to understand the frequency of 91 in 143675.

Step 1:
91 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 91

Let's proceed to step 2:
91 can be fit into 14 0 times, resulting in a remainder of 14.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 14 after subtracting 0 from 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 91

Going ahead to step 3:
When dividing 143 by 91, we get 1 with a remainder of 52.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 52 after subtracting 91 from 143.
Bring next digit (6) of the dividend behind the 52 and repeat the process: 526 / 91

Going ahead to step 4:
526 divided by 91 is 5 with a remainder of 71.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Subtracting 455 from 526 leaves us with 71.
Bring next digit (7) of the dividend behind the 71 and repeat the process: 717 / 91

Step 5:
The number 91 fits into 717 7 times, leaving a remainder of 80.
The next digit of our result is 7. 
Result so far: 157.0
The remainder is 80 after subtracting 637 from 717.
Include the next digit (5) from the dividend after 80, then repeat: 805 / 91

On to step 6:
91 goes into 805 8 times with a remainder of 77.
Record the quotient 8 as the next digit in the result. 
Result so far: 1578.0
Subtract 728 from 805 to get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Going ahead to step 7:
770 divided by 91 is 8 with a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 1578.8
Deduct 728 from 770 and we're left 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.

Advancing to step 8:
The number 91 fits into 420 4 times, leaving a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 1578.84
If we take 364 away from 420, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 9:
When dividing 560 by 91, we get 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 1578.846
Subtract 546 from 560 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.

Going ahead to step 10:
When dividing 140 by 91, we get 1 with a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 1578.8461
The remainder is 49 after subtracting 91 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Step 11:
91 goes into 490 5 times with a remainder of 35.
The next digit of our result is 5. 
Result so far: 1578.84615
The remainder is 35 after subtracting 455 from 490.
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 12:
350 divided by 91 is 3 with a remainder of 77.
Use 3 as the next digit of our solution. 
Result so far: 1578.846153
If we subtract 273 from 350, we get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Going ahead to step 13:
When dividing 770 by 91, we get 8 with a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 1578.8461538
The remainder is 42 after subtracting 728 from 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 14:
If we divide 420 by 91, we get 4 and a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 1578.84615384
Subtracting 364 from 420 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

The final result is 1578.84615384 with a remainder of 5.6e-08.