We look at the division of 29311629 by 91 
The aim is to understand the frequency of 91 in 29311629.

Step 1:
If we divide 2 by 91, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 91

Let's proceed to step 2:
When dividing 29 by 91, we get 0 with a remainder of 29.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 29 after subtracting 0 from 29.
Grab the next digit (3) from the dividend, add it to 29, then carry on: 293 / 91

Advancing to step 3:
When dividing 293 by 91, we get 3 with a remainder of 20.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 273 from 293, we get 20.
Fetch the next digit (1) from the dividend, attach it to 20 and continue: 201 / 91

Going ahead to step 4:
If we divide 201 by 91, we get 2 and a remainder of 19.
Record the quotient 2 as the next digit in the result. 
Result so far: 32.0
The remainder is 19 after subtracting 182 from 201.
Take the next digit (1) from the dividend and append it to 19, then repeat: 191 / 91

Moving on to step 5:
The number 91 fits into 191 2 times, leaving a remainder of 9.
The number 2 becomes the next digit in our result. 
Result so far: 322.0
Subtract 182 from 191 to get 9.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 91

Moving on to step 6:
96 divided by 91 is 1 with a remainder of 5.
Record the quotient 1 as the next digit in the result. 
Result so far: 3221.0
If we take 91 away from 96, we end up with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 91

Let's proceed to step 7:
52 divided by 91 is 0 with a remainder of 52.
Put 0 as the next digit of the answer. 
Result so far: 32210.0
Subtract 0 from 52 to get 52.
Grab the next digit (9) from the dividend, add it to 52, then carry on: 529 / 91

On to step 8:
If we divide 529 by 91, we get 5 and a remainder of 74.
The number 5 becomes the next digit in our result. 
Result so far: 322105.0
If we take 455 away from 529, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 9:
91 goes into 740 8 times with a remainder of 12.
The next digit of our result is 8. 
Result so far: 322105.8
Subtracting 728 from 740 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 10:
120 divided by 91 is 1 with a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 322105.81
If we subtract 91 from 120, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 11:
If we divide 290 by 91, we get 3 and a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 322105.813
The remainder is 17 after subtracting 273 from 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 12:
170 divided by 91 is 1 with a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 322105.8131
Subtract 91 from 170 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 13:
91 can be fit into 790 8 times, resulting in a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 322105.81318
If we take 728 away from 790, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 14:
620 divided by 91 is 6 with a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 322105.813186
If we subtract 546 from 620, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 15:
When dividing 740 by 91, we get 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 322105.8131868
If we take 728 away from 740, we end up 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.

Going ahead to step 16:
91 goes into 120 1 times with a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 322105.81318681
The remainder is 29 after subtracting 91 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The quotient of the division is 322105.81318681, and the remainder is 2.9e-08.