631441 ÷ 91 
The aim is to understand the frequency of 91 in 631441.

On to step 1:
91 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 91

Step 2:
When dividing 63 by 91, we get 0 with a remainder of 63.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Bring next digit (1) of the dividend behind the 63 and repeat the process: 631 / 91

Moving on to step 3:
631 divided by 91 is 6 with a remainder of 85.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtract 546 from 631 to get 85.
Take the next digit (4) from the dividend and append it to 85, then repeat: 854 / 91

On to step 4:
The number 91 fits into 854 9 times, leaving a remainder of 35.
Write down 9 as next digit of the result. 
Result so far: 69.0
Subtract 819 from 854 to get 35.
Bring next digit (4) of the dividend behind the 35 and repeat the process: 354 / 91

Step 5:
91 can be fit into 354 3 times, resulting in a remainder of 81.
Record the quotient 3 as the next digit in the result. 
Result so far: 693.0
Deduct 273 from 354 and we're left with 81.
Bring next digit (1) of the dividend behind the 81 and repeat the process: 811 / 91

Step 6:
The number 91 fits into 811 8 times, leaving a remainder of 83.
Use 8 as the next digit of our solution. 
Result so far: 6938.0
Subtracting 728 from 811 leaves us with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

On to step 7:
91 goes into 830 9 times with a remainder of 11.
The next digit of our result is 9. 
Result so far: 6938.9
Deduct 819 from 830 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 8:
110 divided by 91 is 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 6938.91
Subtracting 91 from 110 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 9:
When dividing 190 by 91, we get 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 6938.912
Deduct 182 from 190 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 10:
91 goes into 80 0 times with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 6938.912
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 11:
91 can be fit into 800 8 times, resulting in a remainder of 72.
Write down 8 as next digit of the result. 
Result so far: 6938.91208
If we take 728 away from 800, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 12:
The number 91 fits into 720 7 times, leaving a remainder of 83.
Write down 7 as next digit of the result. 
Result so far: 6938.912087
If we subtract 637 from 720, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Going ahead to step 13:
91 can be fit into 830 9 times, resulting in a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 6938.9120879
Subtract 819 from 830 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 14:
The number 91 fits into 110 1 times, leaving a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 6938.91208791
Deduct 91 from 110 and we're left with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final result is 6938.91208791 with a remainder of 1.9e-08.