Let's divide 210354 by 91
The aim is to understand the frequency of 91 in 210354.

Going ahead to step 1:
The number 91 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 91

Let's proceed to step 2:
If we divide 21 by 91, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 91

Advancing to step 3:
The number 91 fits into 210 2 times, leaving a remainder of 28.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 182 from 210 and we're left with 28.
Fetch the next digit (3) from the dividend, attach it to 28 and continue: 283 / 91

Moving on to step 4:
91 can be fit into 283 3 times, resulting in a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 23.0
If we subtract 273 from 283, we get 10.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 91

Step 5:
91 can be fit into 105 1 times, resulting in a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 231.0
Subtract 91 from 105 to get 14.
Fetch the next digit (4) from the dividend, attach it to 14 and continue: 144 / 91

On to step 6:
91 goes into 144 1 times with a remainder of 53.
The number 1 becomes the next digit in our result. 
Result so far: 2311.0
The remainder is 53 after subtracting 91 from 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 7:
The number 91 fits into 530 5 times, leaving a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 2311.5
If we subtract 455 from 530, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 8:
When dividing 750 by 91, we get 8 with a remainder of 22.
The next digit of our result is 8. 
Result so far: 2311.58
Subtract 728 from 750 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 9:
91 goes into 220 2 times with a remainder of 38.
The next digit of our result is 2. 
Result so far: 2311.582
If we take 182 away from 220, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 10:
380 divided by 91 is 4 with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 2311.5824
Subtracting 364 from 380 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 11:
When dividing 160 by 91, we get 1 with a remainder of 69.
Use 1 as the next digit of our solution. 
Result so far: 2311.58241
If we take 91 away from 160, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 12:
The number 91 fits into 690 7 times, leaving a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 2311.582417
Subtracting 637 from 690 leaves us with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 13:
If we divide 530 by 91, we get 5 and a remainder of 75.
The next digit of our result is 5. 
Result so far: 2311.5824175
Subtract 455 from 530 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 14:
91 can be fit into 750 8 times, resulting in a remainder of 22.
Put 8 as the next digit of the answer. 
Result so far: 2311.58241758
If we subtract 728 from 750, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The final result is 2311.58241758 with a remainder of 2.2e-08.