130512 ÷ 91 
The aim is to understand the frequency of 91 in 130512.

Step 1:
1 divided by 91 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 91

Advancing to step 2:
91 goes into 13 0 times with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 13 after subtracting 0 from 13.
Bring next digit (0) of the dividend behind the 13 and repeat the process: 130 / 91

Advancing to step 3:
130 divided by 91 is 1 with a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 39 after subtracting 91 from 130.
Append the next digit (5) from the dividend to 39 and continue with: 395 / 91

Advancing to step 4:
If we divide 395 by 91, we get 4 and a remainder of 31.
The next digit of our result is 4. 
Result so far: 14.0
The remainder is 31 after subtracting 364 from 395.
Fetch the next digit (1) from the dividend, attach it to 31 and continue: 311 / 91

On to step 5:
When dividing 311 by 91, we get 3 with a remainder of 38.
The next digit of our result is 3. 
Result so far: 143.0
If we subtract 273 from 311, we get 38.
Bring next digit (2) of the dividend behind the 38 and repeat the process: 382 / 91

Step 6:
If we divide 382 by 91, we get 4 and a remainder of 18.
Record the quotient 4 as the next digit in the result. 
Result so far: 1434.0
Subtracting 364 from 382 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
91 can be fit into 180 1 times, resulting in a remainder of 89.
The next digit of our result is 1. 
Result so far: 1434.1
Subtracting 91 from 180 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

On to step 8:
91 can be fit into 890 9 times, resulting in a remainder of 71.
Write down 9 as next digit of the result. 
Result so far: 1434.19
If we subtract 819 from 890, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Let's proceed to step 9:
91 can be fit into 710 7 times, resulting in a remainder of 73.
Put 7 as the next digit of the answer. 
Result so far: 1434.197
Subtracting 637 from 710 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 10:
91 goes into 730 8 times with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 1434.1978
The remainder is 2 after subtracting 728 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 11:
When dividing 20 by 91, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 1434.1978
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 12:
200 divided by 91 is 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 1434.197802
If we subtract 182 from 200, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 13:
If we divide 180 by 91, we get 1 and a remainder of 89.
Put 1 as the next digit of the answer. 
Result so far: 1434.1978021
Subtract 91 from 180 to get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 14:
When dividing 890 by 91, we get 9 with a remainder of 71.
The next digit of our result is 9. 
Result so far: 1434.19780219
Deduct 819 from 890 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Our division results in 1434.19780219 with a remaining 7.1e-08.