981436 divided by 91 
The aim is to understand the frequency of 91 in 981436.

Step 1:
When dividing 9 by 91, we get 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 91

On to step 2:
91 can be fit into 98 1 times, resulting in a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 91 from 98, we get 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 91

Moving on to step 3:
The number 91 fits into 71 0 times, leaving a remainder of 71.
Write down 0 as next digit of the result. 
Result so far: 10.0
The remainder is 71 after subtracting 0 from 71.
Take the next digit (4) from the dividend and append it to 71, then repeat: 714 / 91

Advancing to step 4:
714 divided by 91 is 7 with a remainder of 77.
The number 7 becomes the next digit in our result. 
Result so far: 107.0
If we take 637 away from 714, we end up with 77.
Take the next digit (3) from the dividend and append it to 77, then repeat: 773 / 91

Going ahead to step 5:
773 divided by 91 is 8 with a remainder of 45.
Record the quotient 8 as the next digit in the result. 
Result so far: 1078.0
If we subtract 728 from 773, we get 45.
Fetch the next digit (6) from the dividend, attach it to 45 and continue: 456 / 91

Moving on to step 6:
If we divide 456 by 91, we get 5 and a remainder of 1.
The next digit of our result is 5. 
Result so far: 10785.0
If we take 455 away from 456, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
The number 91 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 10785.0
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
91 goes into 100 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 10785.01
If we take 91 away from 100, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 9:
91 can be fit into 90 0 times, resulting in a remainder of 90.
The next digit of our result is 0. 
Result so far: 10785.01
If we subtract 0 from 90, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Let's proceed to step 10:
91 can be fit into 900 9 times, resulting in a remainder of 81.
The next digit of our result is 9. 
Result so far: 10785.0109
Deduct 819 from 900 and we're left with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Moving on to step 11:
91 goes into 810 8 times with a remainder of 82.
Write down 8 as next digit of the result. 
Result so far: 10785.01098
If we take 728 away from 810, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 12:
If we divide 820 by 91, we get 9 and a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 10785.010989
If we subtract 819 from 820, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 13:
When dividing 10 by 91, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 10785.010989
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 14:
When dividing 100 by 91, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 10785.01098901
Deduct 91 from 100 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Our division results in 10785.01098901 with a remaining 9e-09.