Let's divide 910645 by 3
The aim is to understand the frequency of 3 in 910645.

Step 1:
When dividing 9 by 3, we get 3 with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we subtract 9 from 9, we get 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 3

Advancing to step 2:
The number 3 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 30.0
If we take 0 away from 1, we end up with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 3

On to step 3:
The number 3 fits into 10 3 times, leaving a remainder of 1.
The next digit of our result is 3. 
Result so far: 303.0
If we take 9 away from 10, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 3

Going ahead to step 4:
3 can be fit into 16 5 times, resulting in a remainder of 1.
Put 5 as the next digit of the answer. 
Result so far: 3035.0
Deduct 15 from 16 and we're left with 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 3

Step 5:
The number 3 fits into 14 4 times, leaving a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 30354.0
If we subtract 12 from 14, we get 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 3

On to step 6:
The number 3 fits into 25 8 times, leaving a remainder of 1.
Record the quotient 8 as the next digit in the result. 
Result so far: 303548.0
Subtract 24 from 25 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:
When dividing 10 by 3, we get 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 303548.3
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 8:
3 goes into 10 3 times with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 303548.33
If we take 9 away from 10, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

After the division, we end up with 303548.33 and a remainder of 0.001.