340424 ÷ 91 
The aim is to understand the frequency of 91 in 340424.

Going ahead to step 1:
91 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 91

On to step 2:
91 can be fit into 34 0 times, resulting in a remainder of 34.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 34, we get 34.
Grab the next digit (0) from the dividend, add it to 34, then carry on: 340 / 91

Step 3:
The number 91 fits into 340 3 times, leaving a remainder of 67.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 273 away from 340, we end up with 67.
Grab the next digit (4) from the dividend, add it to 67, then carry on: 674 / 91

Going ahead to step 4:
674 divided by 91 is 7 with a remainder of 37.
Record the quotient 7 as the next digit in the result. 
Result so far: 37.0
Subtract 637 from 674 to get 37.
Take the next digit (2) from the dividend and append it to 37, then repeat: 372 / 91

On to step 5:
91 can be fit into 372 4 times, resulting in a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 374.0
Subtract 364 from 372 to get 8.
Grab the next digit (4) from the dividend, add it to 8, then carry on: 84 / 91

Moving on to step 6:
The number 91 fits into 84 0 times, leaving a remainder of 84.
Write down 0 as next digit of the result. 
Result so far: 3740.0
Subtract 0 from 84 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Going ahead to step 7:
The number 91 fits into 840 9 times, leaving a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 3740.9
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.

Step 8:
The number 91 fits into 210 2 times, leaving a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 3740.92
Deduct 182 from 210 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 9:
When dividing 280 by 91, we get 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 3740.923
If we subtract 273 from 280, we 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.

Advancing to step 10:
If we divide 70 by 91, we get 0 and a remainder of 70.
The next digit of our result is 0. 
Result so far: 3740.923
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.

Step 11:
91 can be fit into 700 7 times, resulting in a remainder of 63.
Write down 7 as next digit of the result. 
Result so far: 3740.92307
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.

On to step 12:
91 goes into 630 6 times with a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 3740.923076
The remainder is 84 after subtracting 546 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Let's proceed to step 13:
The number 91 fits into 840 9 times, leaving a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 3740.9230769
Deduct 819 from 840 and we're left 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.

On to step 14:
If we divide 210 by 91, we get 2 and a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 3740.92307692
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.

After the division, we end up with 3740.92307692 and a remainder of 2.8e-08.