858205 divided by 31 
The aim is to understand the frequency of 31 in 858205.

Step 1:
31 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 31

Step 2:
When dividing 85 by 31, we get 2 with a remainder of 23.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 62 from 85 and we're left with 23.
Bring next digit (8) of the dividend behind the 23 and repeat the process: 238 / 31

On to step 3:
If we divide 238 by 31, we get 7 and a remainder of 21.
Write down 7 as next digit of the result. 
Result so far: 27.0
Subtract 217 from 238 to get 21.
Take the next digit (2) from the dividend and append it to 21, then repeat: 212 / 31

Going ahead to step 4:
31 goes into 212 6 times with a remainder of 26.
Write down 6 as next digit of the result. 
Result so far: 276.0
Deduct 186 from 212 and we're left with 26.
Bring next digit (0) of the dividend behind the 26 and repeat the process: 260 / 31

Moving on to step 5:
If we divide 260 by 31, we get 8 and a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 2768.0
Subtracting 248 from 260 leaves us with 12.
Bring next digit (5) of the dividend behind the 12 and repeat the process: 125 / 31

Step 6:
31 goes into 125 4 times with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 27684.0
Subtract 124 from 125 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
The number 31 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 27684.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
31 can be fit into 100 3 times, resulting in a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 27684.03
If we take 93 away from 100, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 9:
31 can be fit into 70 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 27684.032
Subtracting 62 from 70 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
31 can be fit into 80 2 times, resulting in a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 27684.0322
If we subtract 62 from 80, 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.

The final result is 27684.0322 with a remainder of 0.00018.