We look at the division of 81806306 by 356 
The aim is to understand the frequency of 356 in 81806306.

On to step 1:
If we divide 8 by 356, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 356

Step 2:
356 can be fit into 81 0 times, resulting in a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Include the next digit (8) from the dividend after 81, then repeat: 818 / 356

Going ahead to step 3:
The number 356 fits into 818 2 times, leaving a remainder of 106.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 712 from 818 to get 106.
Append the next digit (0) from the dividend to 106 and continue with: 1060 / 356

Going ahead to step 4:
When dividing 1060 by 356, we get 2 with a remainder of 348.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
The remainder is 348 after subtracting 712 from 1060.
Fetch the next digit (6) from the dividend, attach it to 348 and continue: 3486 / 356

Going ahead to step 5:
The number 356 fits into 3486 9 times, leaving a remainder of 282.
The next digit of our result is 9. 
Result so far: 229.0
Subtracting 3204 from 3486 leaves us with 282.
Bring next digit (3) of the dividend behind the 282 and repeat the process: 2823 / 356

Moving on to step 6:
356 goes into 2823 7 times with a remainder of 331.
Use 7 as the next digit of our solution. 
Result so far: 2297.0
If we subtract 2492 from 2823, we get 331.
Take the next digit (0) from the dividend and append it to 331, then repeat: 3310 / 356

Let's proceed to step 7:
If we divide 3310 by 356, we get 9 and a remainder of 106.
The next digit of our result is 9. 
Result so far: 22979.0
The remainder is 106 after subtracting 3204 from 3310.
Take the next digit (6) from the dividend and append it to 106, then repeat: 1066 / 356

Going ahead to step 8:
1066 divided by 356 is 2 with a remainder of 354.
Use 2 as the next digit of our solution. 
Result so far: 229792.0
The remainder is 354 after subtracting 712 from 1066.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3540, and continue the process.

Step 9:
The number 356 fits into 3540 9 times, leaving a remainder of 336.
The next digit of our result is 9. 
Result so far: 229792.9
If we subtract 3204 from 3540, we get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

On to step 10:
356 goes into 3360 9 times with a remainder of 156.
Put 9 as the next digit of the answer. 
Result so far: 229792.99
The remainder is 156 after subtracting 3204 from 3360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Our division results in 229792.99 with a remaining 0.156.