635642 divided by 91 
The aim is to understand the frequency of 91 in 635642.

Step 1:
When dividing 6 by 91, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 91

Let's proceed to step 2:
The number 91 fits into 63 0 times, leaving a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 63, we end up with 63.
Fetch the next digit (5) from the dividend, attach it to 63 and continue: 635 / 91

Step 3:
91 can be fit into 635 6 times, resulting in a remainder of 89.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 546 from 635, we get 89.
Grab the next digit (6) from the dividend, add it to 89, then carry on: 896 / 91

On to step 4:
If we divide 896 by 91, we get 9 and a remainder of 77.
The number 9 becomes the next digit in our result. 
Result so far: 69.0
Deduct 819 from 896 and we're left with 77.
Include the next digit (4) from the dividend after 77, then repeat: 774 / 91

On to step 5:
If we divide 774 by 91, we get 8 and a remainder of 46.
Write down 8 as next digit of the result. 
Result so far: 698.0
If we take 728 away from 774, we end up with 46.
Include the next digit (2) from the dividend after 46, then repeat: 462 / 91

Let's proceed to step 6:
If we divide 462 by 91, we get 5 and a remainder of 7.
Write down 5 as next digit of the result. 
Result so far: 6985.0
Subtract 455 from 462 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
91 can be fit into 70 0 times, resulting in a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 6985.0
Subtract 0 from 70 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 8:
When dividing 700 by 91, we get 7 with a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 6985.07
Subtracting 637 from 700 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 9:
91 can be fit into 630 6 times, resulting in a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 6985.076
Subtracting 546 from 630 leaves us with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 10:
If we divide 840 by 91, we get 9 and a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 6985.0769
If we take 819 away from 840, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 11:
If we divide 210 by 91, we get 2 and a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 6985.07692
The remainder is 28 after subtracting 182 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 12:
If we divide 280 by 91, we get 3 and a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 6985.076923
If we take 273 away from 280, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 13:
The number 91 fits into 70 0 times, leaving a remainder of 70.
The next digit of our result is 0. 
Result so far: 6985.076923
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

On to step 14:
When dividing 700 by 91, we get 7 with a remainder of 63.
Use 7 as the next digit of our solution. 
Result so far: 6985.07692307
Subtract 637 from 700 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

In conclusion, the division gives 6985.07692307 with a balance of 6.3e-08.