We look at the division of 67834319 by 91 
The aim is to understand the frequency of 91 in 67834319.

Let's proceed to step 1:
The number 91 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 91

Let's proceed to step 2:
67 divided by 91 is 0 with a remainder of 67.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 67 after subtracting 0 from 67.
Grab the next digit (8) from the dividend, add it to 67, then carry on: 678 / 91

Moving on to step 3:
When dividing 678 by 91, we get 7 with a remainder of 41.
Write down 7 as next digit of the result. 
Result so far: 7.0
If we take 637 away from 678, we end up with 41.
Grab the next digit (3) from the dividend, add it to 41, then carry on: 413 / 91

Advancing to step 4:
When dividing 413 by 91, we get 4 with a remainder of 49.
Use 4 as the next digit of our solution. 
Result so far: 74.0
Deduct 364 from 413 and we're left with 49.
Include the next digit (4) from the dividend after 49, then repeat: 494 / 91

Moving on to step 5:
The number 91 fits into 494 5 times, leaving a remainder of 39.
Use 5 as the next digit of our solution. 
Result so far: 745.0
If we subtract 455 from 494, we get 39.
Take the next digit (3) from the dividend and append it to 39, then repeat: 393 / 91

Going ahead to step 6:
393 divided by 91 is 4 with a remainder of 29.
The next digit of our result is 4. 
Result so far: 7454.0
If we take 364 away from 393, we end up with 29.
Bring next digit (1) of the dividend behind the 29 and repeat the process: 291 / 91

Let's proceed to step 7:
291 divided by 91 is 3 with a remainder of 18.
The number 3 becomes the next digit in our result. 
Result so far: 74543.0
Subtracting 273 from 291 leaves us with 18.
Take the next digit (9) from the dividend and append it to 18, then repeat: 189 / 91

On to step 8:
When dividing 189 by 91, we get 2 with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 745432.0
The remainder is 7 after subtracting 182 from 189.
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 9:
If we divide 70 by 91, we get 0 and a remainder of 70.
Use 0 as the next digit of our solution. 
Result so far: 745432.0
Subtracting 0 from 70 leaves us 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.

Let's proceed to step 10:
91 goes into 700 7 times with a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 745432.07
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.

On to step 11:
630 divided by 91 is 6 with a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 745432.076
Deduct 546 from 630 and we're left 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.

On to step 12:
91 goes into 840 9 times with a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 745432.0769
The remainder is 21 after subtracting 819 from 840.
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 13:
The number 91 fits into 210 2 times, leaving a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 745432.07692
If we subtract 182 from 210, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 14:
280 divided by 91 is 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 745432.076923
Deduct 273 from 280 and we're left 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 15:
70 divided by 91 is 0 with a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 745432.076923
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.

Let's proceed to step 16:
If we divide 700 by 91, we get 7 and a remainder of 63.
Record the quotient 7 as the next digit in the result. 
Result so far: 745432.07692307
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.

After the division, we end up with 745432.07692307 and a remainder of 6.3e-08.