Let's divide 81956891 by 306
The aim is to understand the frequency of 306 in 81956891.

Going ahead to step 1:
If we divide 8 by 306, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 306

Let's proceed to step 2:
306 goes into 81 0 times with a remainder of 81.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Append the next digit (9) from the dividend to 81 and continue with: 819 / 306

Advancing to step 3:
The number 306 fits into 819 2 times, leaving a remainder of 207.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 612 from 819 to get 207.
Take the next digit (5) from the dividend and append it to 207, then repeat: 2075 / 306

Going ahead to step 4:
The number 306 fits into 2075 6 times, leaving a remainder of 239.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
If we subtract 1836 from 2075, we get 239.
Grab the next digit (6) from the dividend, add it to 239, then carry on: 2396 / 306

Moving on to step 5:
306 goes into 2396 7 times with a remainder of 254.
The number 7 becomes the next digit in our result. 
Result so far: 267.0
Subtract 2142 from 2396 to get 254.
Fetch the next digit (8) from the dividend, attach it to 254 and continue: 2548 / 306

Going ahead to step 6:
2548 divided by 306 is 8 with a remainder of 100.
Record the quotient 8 as the next digit in the result. 
Result so far: 2678.0
The remainder is 100 after subtracting 2448 from 2548.
Append the next digit (9) from the dividend to 100 and continue with: 1009 / 306

On to step 7:
The number 306 fits into 1009 3 times, leaving a remainder of 91.
Put 3 as the next digit of the answer. 
Result so far: 26783.0
If we subtract 918 from 1009, we get 91.
Include the next digit (1) from the dividend after 91, then repeat: 911 / 306

On to step 8:
306 goes into 911 2 times with a remainder of 299.
Record the quotient 2 as the next digit in the result. 
Result so far: 267832.0
Subtract 612 from 911 to get 299.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2990, and continue the process.

On to step 9:
306 can be fit into 2990 9 times, resulting in a remainder of 236.
The next digit of our result is 9. 
Result so far: 267832.9
Subtract 2754 from 2990 to get 236.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2360, and continue the process.

Let's proceed to step 10:
The number 306 fits into 2360 7 times, leaving a remainder of 218.
The number 7 becomes the next digit in our result. 
Result so far: 267832.97
Deduct 2142 from 2360 and we're left with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Advancing to step 11:
When dividing 2180 by 306, we get 7 with a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 267832.977
If we take 2142 away from 2180, 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.

The final outcome is 267832.977, with a leftover of 0.0038.