983009 divided by 91 
The aim is to understand the frequency of 91 in 983009.

Step 1:
91 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 91

On to step 2:
91 goes into 98 1 times with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 91 from 98 and we're left with 7.
Bring next digit (3) of the dividend behind the 7 and repeat the process: 73 / 91

On to step 3:
91 goes into 73 0 times with a remainder of 73.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
If we subtract 0 from 73, we get 73.
Fetch the next digit (0) from the dividend, attach it to 73 and continue: 730 / 91

Going ahead to step 4:
If we divide 730 by 91, we get 8 and a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 108.0
Subtracting 728 from 730 leaves us with 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 91

Let's proceed to step 5:
When dividing 20 by 91, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 1080.0
The remainder is 20 after subtracting 0 from 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 91

Step 6:
When dividing 209 by 91, we get 2 with a remainder of 27.
The number 2 becomes the next digit in our result. 
Result so far: 10802.0
If we subtract 182 from 209, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 7:
The number 91 fits into 270 2 times, leaving a remainder of 88.
Write down 2 as next digit of the result. 
Result so far: 10802.2
Subtract 182 from 270 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Let's proceed to step 8:
880 divided by 91 is 9 with a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 10802.29
If we subtract 819 from 880, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Let's proceed to step 9:
610 divided by 91 is 6 with a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 10802.296
The remainder is 64 after subtracting 546 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 10:
91 can be fit into 640 7 times, resulting in a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 10802.2967
Deduct 637 from 640 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 11:
91 can be fit into 30 0 times, resulting in a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 10802.2967
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 12:
91 goes into 300 3 times with a remainder of 27.
The next digit of our result is 3. 
Result so far: 10802.296703
Subtract 273 from 300 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 13:
91 goes into 270 2 times with a remainder of 88.
Use 2 as the next digit of our solution. 
Result so far: 10802.2967032
Deduct 182 from 270 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 14:
91 goes into 880 9 times with a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 10802.29670329
If we subtract 819 from 880, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

The final result is 10802.29670329 with a remainder of 6.1e-08.