858107 divided by 3 
The aim is to understand the frequency of 3 in 858107.

Advancing to step 1:
The number 3 fits into 8 2 times, leaving a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 6 from 8, we get 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 3

Advancing to step 2:
The number 3 fits into 25 8 times, leaving a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 28.0
Subtracting 24 from 25 leaves us with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 3

Let's proceed to step 3:
3 goes into 18 6 times with a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 286.0
Subtract 18 from 18 to get 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 3

Moving on to step 4:
When dividing 1 by 3, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 2860.0
If we subtract 0 from 1, we get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 3

Going ahead to step 5:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 28603.0
Subtracting 9 from 10 leaves us with 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 3

On to step 6:
The number 3 fits into 17 5 times, leaving a remainder of 2.
Use 5 as the next digit of our solution. 
Result so far: 286035.0
Deduct 15 from 17 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 7:
When dividing 20 by 3, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 286035.6
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
The number 3 fits into 20 6 times, leaving a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 286035.66
Deduct 18 from 20 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 286035.66 and a remainder of 0.002.