We're dividing 37421821 by 91 
The aim is to understand the frequency of 91 in 37421821.

Step 1:
The number 91 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 91

On to step 2:
The number 91 fits into 37 0 times, leaving a remainder of 37.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 37, we end up with 37.
Fetch the next digit (4) from the dividend, attach it to 37 and continue: 374 / 91

Let's proceed to step 3:
When dividing 374 by 91, we get 4 with a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 364 away from 374, we end up with 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 91

Advancing to step 4:
The number 91 fits into 102 1 times, leaving a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Subtract 91 from 102 to get 11.
Append the next digit (1) from the dividend to 11 and continue with: 111 / 91

Step 5:
When dividing 111 by 91, we get 1 with a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 411.0
If we subtract 91 from 111, we get 20.
Grab the next digit (8) from the dividend, add it to 20, then carry on: 208 / 91

Moving on to step 6:
208 divided by 91 is 2 with a remainder of 26.
Record the quotient 2 as the next digit in the result. 
Result so far: 4112.0
Deduct 182 from 208 and we're left with 26.
Grab the next digit (2) from the dividend, add it to 26, then carry on: 262 / 91

Advancing to step 7:
If we divide 262 by 91, we get 2 and a remainder of 80.
Put 2 as the next digit of the answer. 
Result so far: 41122.0
If we take 182 away from 262, we end up with 80.
Append the next digit (1) from the dividend to 80 and continue with: 801 / 91

Advancing to step 8:
When dividing 801 by 91, we get 8 with a remainder of 73.
Record the quotient 8 as the next digit in the result. 
Result so far: 411228.0
If we subtract 728 from 801, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 9:
If we divide 730 by 91, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 411228.8
Subtract 728 from 730 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 10:
20 divided by 91 is 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 411228.8
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 11:
91 can be fit into 200 2 times, resulting in a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 411228.802
If we subtract 182 from 200, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 12:
180 divided by 91 is 1 with a remainder of 89.
Write down 1 as next digit of the result. 
Result so far: 411228.8021
The remainder is 89 after subtracting 91 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Moving on to step 13:
The number 91 fits into 890 9 times, leaving a remainder of 71.
Use 9 as the next digit of our solution. 
Result so far: 411228.80219
Deduct 819 from 890 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 14:
91 can be fit into 710 7 times, resulting in a remainder of 73.
Record the quotient 7 as the next digit in the result. 
Result so far: 411228.802197
Subtracting 637 from 710 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Going ahead to step 15:
When dividing 730 by 91, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 411228.8021978
Subtracting 728 from 730 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 16:
If we divide 20 by 91, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 411228.8021978
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final result is 411228.8021978 with a remainder of 2e-08.