336616 ÷ 91 
The aim is to understand the frequency of 91 in 336616.

On to step 1:
The number 91 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 91

Step 2:
If we divide 33 by 91, we get 0 and a remainder of 33.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 33 leaves us with 33.
Fetch the next digit (6) from the dividend, attach it to 33 and continue: 336 / 91

Going ahead to step 3:
91 can be fit into 336 3 times, resulting in a remainder of 63.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we subtract 273 from 336, we get 63.
Take the next digit (6) from the dividend and append it to 63, then repeat: 636 / 91

Going ahead to step 4:
If we divide 636 by 91, we get 6 and a remainder of 90.
The next digit of our result is 6. 
Result so far: 36.0
If we subtract 546 from 636, we get 90.
Append the next digit (1) from the dividend to 90 and continue with: 901 / 91

Let's proceed to step 5:
When dividing 901 by 91, we get 9 with a remainder of 82.
The number 9 becomes the next digit in our result. 
Result so far: 369.0
Subtracting 819 from 901 leaves us with 82.
Fetch the next digit (6) from the dividend, attach it to 82 and continue: 826 / 91

Step 6:
When dividing 826 by 91, we get 9 with a remainder of 7.
The number 9 becomes the next digit in our result. 
Result so far: 3699.0
Deduct 819 from 826 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 7:
91 can be fit into 70 0 times, resulting in a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 3699.0
If we take 0 away from 70, we end up 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 8:
91 can be fit into 700 7 times, resulting in a remainder of 63.
The next digit of our result is 7. 
Result so far: 3699.07
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.

Moving on to step 9:
If we divide 630 by 91, we get 6 and a remainder of 84.
Put 6 as the next digit of the answer. 
Result so far: 3699.076
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 10:
The number 91 fits into 840 9 times, leaving a remainder of 21.
The next digit of our result is 9. 
Result so far: 3699.0769
Subtracting 819 from 840 leaves us 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.

Going ahead to step 11:
The number 91 fits into 210 2 times, leaving a remainder of 28.
The next digit of our result is 2. 
Result so far: 3699.07692
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.

Let's proceed to step 12:
If we divide 280 by 91, we get 3 and a remainder of 7.
The next digit of our result is 3. 
Result so far: 3699.076923
The remainder is 7 after subtracting 273 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 13:
91 goes into 70 0 times with a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 3699.076923
If we take 0 away from 70, we end up 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.

Advancing to step 14:
When dividing 700 by 91, we get 7 with a remainder of 63.
The number 7 becomes the next digit in our result. 
Result so far: 3699.07692307
Deduct 637 from 700 and we're left 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.

After the division, we end up with 3699.07692307 and a remainder of 6.3e-08.