Let's divide 81305816 by 491
The aim is to understand the frequency of 491 in 81305816.

Step 1:
8 divided by 491 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 491

Step 2:
81 divided by 491 is 0 with a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Fetch the next digit (3) from the dividend, attach it to 81 and continue: 813 / 491

Moving on to step 3:
The number 491 fits into 813 1 times, leaving a remainder of 322.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 491 from 813 and we're left with 322.
Append the next digit (0) from the dividend to 322 and continue with: 3220 / 491

Advancing to step 4:
The number 491 fits into 3220 6 times, leaving a remainder of 274.
The next digit of our result is 6. 
Result so far: 16.0
Subtract 2946 from 3220 to get 274.
Include the next digit (5) from the dividend after 274, then repeat: 2745 / 491

Let's proceed to step 5:
2745 divided by 491 is 5 with a remainder of 290.
Record the quotient 5 as the next digit in the result. 
Result so far: 165.0
Subtracting 2455 from 2745 leaves us with 290.
Fetch the next digit (8) from the dividend, attach it to 290 and continue: 2908 / 491

Going ahead to step 6:
491 can be fit into 2908 5 times, resulting in a remainder of 453.
The next digit of our result is 5. 
Result so far: 1655.0
Subtract 2455 from 2908 to get 453.
Grab the next digit (1) from the dividend, add it to 453, then carry on: 4531 / 491

Step 7:
491 goes into 4531 9 times with a remainder of 112.
Record the quotient 9 as the next digit in the result. 
Result so far: 16559.0
The remainder is 112 after subtracting 4419 from 4531.
Bring next digit (6) of the dividend behind the 112 and repeat the process: 1126 / 491

Moving on to step 8:
If we divide 1126 by 491, we get 2 and a remainder of 144.
The next digit of our result is 2. 
Result so far: 165592.0
The remainder is 144 after subtracting 982 from 1126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Let's proceed to step 9:
1440 divided by 491 is 2 with a remainder of 458.
Write down 2 as next digit of the result. 
Result so far: 165592.2
Deduct 982 from 1440 and we're left with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

Let's proceed to step 10:
The number 491 fits into 4580 9 times, leaving a remainder of 161.
The number 9 becomes the next digit in our result. 
Result so far: 165592.29
Subtract 4419 from 4580 to get 161.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1610, and continue the process.

Advancing to step 11:
If we divide 1610 by 491, we get 3 and a remainder of 137.
Put 3 as the next digit of the answer. 
Result so far: 165592.293
If we take 1473 away from 1610, we end up with 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Let's proceed to step 12:
The number 491 fits into 1370 2 times, leaving a remainder of 388.
Use 2 as the next digit of our solution. 
Result so far: 165592.2932
If we take 982 away from 1370, we end up with 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

On to step 13:
3880 divided by 491 is 7 with a remainder of 443.
Use 7 as the next digit of our solution. 
Result so far: 165592.29327
The remainder is 443 after subtracting 3437 from 3880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

On to step 14:
491 goes into 4430 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 165592.293279
The remainder is 11 after subtracting 4419 from 4430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 15:
If we divide 110 by 491, we get 0 and a remainder of 110.
Use 0 as the next digit of our solution. 
Result so far: 165592.293279
If we subtract 0 from 110, we get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Step 16:
491 can be fit into 1100 2 times, resulting in a remainder of 118.
The number 2 becomes the next digit in our result. 
Result so far: 165592.29327902
Subtract 982 from 1100 to get 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

In conclusion, the division gives 165592.29327902 with a balance of 1.18e-07.