We look at the division of 339336 by 1 
The aim is to understand the frequency of 1 in 339336.

On to step 1:
1 can be fit into 3 3 times, resulting in a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 0 after subtracting 3 from 3.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 1

Going ahead to step 2:
1 goes into 3 3 times with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
Subtract 3 from 3 to get 0.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 1

Going ahead to step 3:
If we divide 9 by 1, we get 9 and a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 339.0
Subtract 9 from 9 to get 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 1

Advancing to step 4:
1 goes into 3 3 times with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 3393.0
The remainder is 0 after subtracting 3 from 3.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 1

On to step 5:
The number 1 fits into 3 3 times, leaving a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 33933.0
The remainder is 0 after subtracting 3 from 3.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 1

Advancing to step 6:
1 goes into 6 6 times with a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 339336.0
If we take 6 away from 6, 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 7:
0 divided by 1 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 339336.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
1 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 339336.0
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.

Our division results in 339336.0 with a remaining 0.0.