We're dividing 390336 by 3 
The aim is to understand the frequency of 3 in 390336.

Step 1:
When dividing 3 by 3, we get 1 with a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 3 from 3 leaves us with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 3

Advancing to step 2:
When dividing 9 by 3, we get 3 with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
The remainder is 0 after subtracting 9 from 9.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 3

Step 3:
0 divided by 3 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 130.0
Subtract 0 from 0 to get 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 3

Let's proceed to step 4:
When dividing 3 by 3, we get 1 with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1301.0
Deduct 3 from 3 and we're left with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 3

Moving on to step 5:
3 can be fit into 3 1 times, resulting in a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 13011.0
If we take 3 away from 3, we end up with 0.
Include the next digit (6) from the dividend after 0, then repeat: 6 / 3

Going ahead to step 6:
3 can be fit into 6 2 times, resulting in a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 130112.0
Deduct 6 from 6 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
3 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 130112.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
When dividing 0 by 3, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 130112.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 130112.0, and the remainder is 0.0.